Omar Mateen (MySpace) 
 
 Police are planning to arrest an alleged accomplice who helped gunman Omar Mateen carry out a mass shooting that killed at least 50 people and injured dozens more at an Orlando LGBT nightclub. 
 
 A top law enforcement source told WFTV-TV that the suspected accomplice would be arrested by Wednesday, but authorities did not release any additional details. 
 
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 The suspected accomplice is either in Florida or has ties to the state, the TV station reported. 
 
 The 29-year-old Mateen was killed in a shootout with police during the deadly rampage at Pulse nightclub. 
 
 Mateen worked as a security guard for G4S and had hoped to become a law enforcement officer, and former classmates at a police academy said he was socially awkward and apparently gay himself. 
 
 “We went to a few gay bars with him, and I was not out at the time, so I declined his offer,” said one former classmate at Indian River Community College. 
 
 The classmate said Mateen was not out, either, and other students felt sorry for him. 
 
 “He just wanted to fit in and no one liked him,” the classmate said. “He was always socially awkward.” 
 
 His father, Seddique Mir Mateen, has apologized for his son’s actions but said “God will punish those involved in homosexuality,” saying that was not a matter for humans to undertake. 
 
 The elder vehemently denied his son was gay. 
 
 “If he was gay, why would he do something like this?” Seddique Mateen asked. 
 
 Mateen married a woman he met online about eight years ago, and the couple had a son, but they divorced because he allegedly became abusive. 
 
 “He was not a stable person,” his ex-wife said. 
 
 Mateen, who was Muslim, became more religious after his divorce, and went several years ago on the pilgrimage to Mecca in Saudi Arabia. 
 
 He claimed an allegiance to the Islamic State and was previously investigated by the FBI for ties to terrorism, although authorities still aren’t sure what links he had to terrorist groups. 
 
 But he continued going to gay bars and setting up profiles on gay dating apps — and was apparently a regular at Pulse. 
 
 At least four regular customers have identified Mateen as a regular at the LGBT club, saying he often drank alone there but sometimes became loud and belligerent. 
 
 One customer said Mateen threatened his friend with a knife. 
 
 Another customer said he exchanged messages with Mateen for about a year through the gay dating app Jack’d but never met him in person until he spotted him about 1 a.m. Sunday going into the club. 
 
 “He walked directly past me,” said Kevin West, who witnessed the deadly rampage. “I said, ‘Hey,’ and he turned and said, ‘Hey, and nodded his head. I could tell by the eyes.” 

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 (CNN) Investigators believe the Orlando nightclub gunman made surveillance trips to the club and a Disney shopping complex earlier this month -- the same week Disney and other sites were hosting Gay Days 2016. 
 
 Omar Mir Seddique Mateen's visits to the Pulse gay nightclub and Disney Springs happened between June 1 and June 6, a law enforcement official said Tuesday. Gay Days 2016 celebrations took place at Walt Disney World and other Orlando locations between May 31 and June 6. 
 
 A law enforcement official said the gunman's wife, Noor Salman, went with her husband to the two locations. It's unclear how much she knew about his intentions. 
 
 Mateen had showed an aversion toward gays -- making inflammatory remarks and expressing outrage at the sight of two men kissing, law enforcement officials and a former co-worker said. 
 
 But sources say he visited gay chat rooms and for years frequented the same nightclub that he would eventually terrorize. 
 
 Was the mass shooting fueled by homophobia? Was the gunman struggling with his own sexuality? Or was he really inspired by ISIS, as his mid-rampage call to 911 suggests? 
 
 Authorities are investigating many angles to try to understand what prompted him to carry out the deadliest mass shooting in U.S. history. A total of 49 people were killed early Sunday and 53 people were wounded. Officials said that 28 victims are still hospitalized, including at least four people who are in critical condition. 
 
 Here's what we know about the gunman: 
 
 Scouting out Disney World, Disney Springs 
 
 JUST WATCHED Investigators look into Omar Mateen's past Replay More Videos ... MUST WATCH Investigators look into Omar Mateen's past 01:53 
 
 Disney security officials told the FBI they believe Mateen visited Disney World on April 26 to conduct surveillance, a law enforcement official told CNN. The FBI is investigating that possibility. 
 
 Mateen's wife also was with him on the Disney World visit. Federal authorities have questioned Salman, who told them, according to a law enforcement official, that her husband had talked about a jihadist attack but she denied knowing he planned to attack the gay club. 
 
 JUST WATCHED Survivor describes final standoff Replay More Videos ... MUST WATCH Survivor describes final standoff 01:26 
 
 More than a month after that Disney World trip, Mateen and his wife visited Pulse and Disney Springs -- an entertainment and shopping complex -- apparently to scout out the locations, a law enforcement official said. Authorities believe he was conducting surveillance, based on information learned in interviews. 
 
 The early June visits took place during the same period Mateen was purchasing the weapons used in the devastating attack. 
 
 Hours before the carnage, Mateen made one last trip to Disney Springs, law enforcement officials said. That time, Mateen was alone. 
 
 Conflicting persona 
 
 Officials say they're looking into the possibility Omar Mateen radicalized on his own. 
 
 To some, Mateen was a homophobic "bigot." To others, he was a friendly regular at the nightclub. 
 
 Chris Callen, who worked at Pulse as a performer, said he had seen Mateen dozens of times. According to Callen's estimate, Mateen visited Pulse twice a month over three years. 
 
 "He was very friendly when we said, 'Hi.' He didn't seem like the kind of guy who just did what he did. It makes no sense," Callen said. "My partner said that he was very nice (and seemed) comfortable." 
 
 Mateen visited gay chat rooms online, two law enforcement officials said. Investigators do not know whether he visited the chat rooms for surveillance purposes ahead of the attack or for personal reasons. 
 
 JUST WATCHED Witness: We thought gunshots were 'part of the music' Replay More Videos ... MUST WATCH Witness: We thought gunshots were 'part of the music' 05:24 
 
 The FBI is interviewing people who claim they met the gunman on gay dating apps, a law enforcement official told CNN's Pamela Brown. Those claims "certainly change the perspective," the source said. 
 
 No men have publicly come forward claiming to have had sexual contact with Mateen. 
 
 On the other hand, a former colleague said Mateen often made homophobic, sexist and racist remarks. 
 
 JUST WATCHED 'Pulse' performer says shooter frequented the club Replay More Videos ... MUST WATCH 'Pulse' performer says shooter frequented the club 02:15 
 
 "He was an angry person, violent in nature, and a bigot to almost every class of person," former co-worker Dan Gilroy told CNN affiliate WPTV . Mateen and Gilroy had worked together at PGA Village in Port St. Lucie. 
 
 Gilroy said Mateen had a temper. 
 
 "He would hit things and as he was hitting things, he would yell, and of course there was always curse words involved," Gilroy told WPTV. "And this wasn't seldom, this was all the time." 
 
 And Mateen's ex-wife, Sitora Yusufiy, says he was often violent, abusive and prone to outbursts, including one instance where she was on the phone with her mother and was slapped so hard the phone broke. 
 
 As questions about Mateen's sexual orientation arise, Yusufiy admitted she does not know if he is gay or not. 
 
 "It doesn't surprise me that he might be gay. And it doesn't surprise me that he was leading two totally different lives and was in such deep conflict within himself," she said in an interview with CNN's Don Lemon. "I hope people can truly understand that this is one insane person that did such a tragic thing." 
 
 FBI had investigated him twice 
 
 JUST WATCHED FBI: Orlando gunman radicalized online Replay More Videos ... MUST WATCH FBI: Orlando gunman radicalized online 04:18 
 
 Mateen first came on the FBI's radar in 2013 when he made "inflammatory comments to co-workers alleging possible terrorist ties," Assistant Special Agent in Charge Ronald Hopper said. But investigators "were unable to verify the substance of his comments," he said. 
 
 In 2014, the FBI interviewed Mateen again over possible connections with Moner Mohammad Abu-Salha , a Florida man who became the first known American suicide bomber in Syria. The two men frequented the same mosque. 
 
 "We determined that contact was minimal and did not constitute a substantive relationship or threat at that time," Hopper said. 
 
 Mateen had worked for nine years as a security officer at G4S Secure Solutions , one of the world's largest private security companies. According to a neighbor, he was a security guard at the St. Lucie County Courthouse, often manning the metal detectors at the front of the building. 
 
 Sheriff Ken Mascara said that in 2013 his staff requested Mateen be transferred from the courthouse because he made inflammatory comments. Mateen's supervisor notified federal agents, after which, the sheriff said, the FBI investigated the guard. 
 
 Mateen told an attorney for G4S about being questioned, an official for the security company told CNN's Rene Marsh. G4S determined Mateen's comments were "exaggerated." 
 
 By that time, Mateen was working security at a retirement village. He had no reprimands in his file and had his security officer license renewed four times -- in each instance passing background checks by the state and FBI. 
 
 Mateen also achieved an above average rating on a psychological test. 
 
 During the gunman's rampage, he called 911 and pledged allegiance to ISIS, a U.S. official said. Mateen also mentioned the Boston Marathon bombers. 
 
 An analysis of Mateen's electronic devices showed searches for jihadist propaganda, including videos of ISIS beheadings, an official said. 
 
 JUST WATCHED What did the FBI know? Replay More Videos ... MUST WATCH What did the FBI know? 02:25 
 
 After meeting with national security officials Tuesday, President Barack Obama said there is no indication a foreign terror group directed the Orlando massacre. But he conceded that "these lone actors or small cells of terrorists are very hard to detect and very hard to prevent." 
 
 Father baffled by killings 
 
 JUST WATCHED Orlando shooter's dad speaks out Replay More Videos ... MUST WATCH Orlando shooter's dad speaks out 01:39 
 
 Mateen's father, Seddique Mateen, said he had no idea his son was about to commit an act of mass violence. 
 
 "I am as shocked as you are," he told CNN. 
 
 The father had an occasional television show on an Afghan satellite channel in which he regularly criticized Afghanistan's government and Pakistan. 
 
 Seddique Mateen said he doesn't believe religion motivated his son's attack. 
 
 "Radicalism? No. He doesn't have a beard even. When someone becomes radical, they grow long beards and they wear clothes that you know, long clothes, and I don't think religion or Islam had nothing to do with this," he said. 
 
 He said his son may have pledged allegiance to ISIS because "he wanted to boost himself." 
 
 But the father condemned the terror group. 
 
 "The way they conduct themselves, they're harming everybody. They're not a religious group. I don't know what they are," he said. "They're a killer group." 

 Noor Mateen, the 30-year-old wife of Orlando nightclub shooter Omar Mateen, is being considered for possible criminal charges, officials say. A law enforcement official told ABC News that she may have known something about the incident in advance but claims she tried to talk him out of the assault. 
 
 News of the potential involvement of Mateen’s wife comes just moments after doctors at Orlando Health, a hospital where first responders brought victims of the shooting, warned that the death toll may rise. 
 
 Noor Mateen was with her husband when he recently bought ammunition and a holster, sources familiar with the investigation told ABC News. The couple had recently gone to the Disney World area together, though authorities are unclear if it was a family trip or if Mateen was there to case a possible target location, the sources said. 
 
 Mateen's wife was not initially forthcoming with investigators, authorities said, but she began to cooperate and answer investigators' questions after she was shown closed-circuit TV footage showing her with her husband at various locations in Orlando, among other things, according to two officials briefed on the probe. Investigators are trying to determine whether they were scouting possible target attacks, the officials said. 
 
 After Noor Mateen began to answer questions, agents administered a polygraph test to determine whether she was telling the truth. 
 
 The couple were married for about three and a half years, Mateen's father, Seddique Mateen, told ABC News. He said he has no idea if she were involved in the attack. 
 
 No final decision has been made whether to charge Noor Mateen, according to the sources. 
 
 After the initial shooting, Mateen not only called 9-1-1 while still inside the Pulse but placed another call to someone he knew, authorities said. 
 
 Mateen was one of multiple contracted security guards who rotated through the St. Lucie County Courthouse as part of a contract with G4S Secure Solutions USA Inc., St. Lucie County Sheriff Ken J. Mascara said. 
 
 The St. Lucie County Sheriff's Office was made aware of "inflammatory comments" made by Mateen in 2013, and a courthouse supervisor requested that Mateen be transferred out of the courthouse rotation permanently, Mascara said. Police then removed Mateen from courthouse security duty and informed federal authorities, at which time the FBI began its investigation into him that was later deemed inconclusive, Mascara said. 
 
 A press conference was held this morning at the hospital to provide updates about the status of survivors of the attack. Dr. Michael Cheatham said that of the 44 patients who were brought to his hospital, 27 were still being treated. Of those 27, six patients were "critically ill." 
 
 Cheatham said that he would be surprised if the death toll did not rise. 
 
 Six of our patients remain critically ill, and 16 of our patients are now stable. — Orlando Health (@orlandohealth) June 14, 2016 
 
 Angel Colon, a survivor of the attack, recounted the story of his ordeal at the club, and expressed his gratitude to the doctors at the hospital. The young man wiped back tears from his eyes as he described being shot in the leg, and collapsing on the ground, where he was trampled by fleeing clubgoers. Colon also expressed gratitude to a police officer who dragged him out of the club. Colon said that the floor of Pulse was littered with broken glass, and that he could sense that his body was wet with blood. 
 
 "If it wasn't for you guys, I wouldn't be here," Colon said to the staff of the hospital, his voice shaking with emotion. "I will love you guys forever." 
 
 Doctors who were called to the scene in the wake of the massacre described the trauma center at Orlando Health as resembling a "war scene" and described the Herculean effort that was required of staff in order to meet the demands created by the bloodshed. 
 
 Mateen, the killer, was said to be a regular at Pulse and other gay clubs in Florida, according to witnesses. Estella Peterkin, head of security at Pulse, told ABC News she had to kick him out for bad behavior on multiple occasions. 
 
 Myspace 
 
 The shooting unfolded over the course of three hours early Sunday morning when Mateen approached the Pulse nightclub armed with a .223 caliber AR-type rifle and a Glock handgun. After engaging in gunfire with an officer stationed outside the club, he entered and sprayed the venue with bullets. Fifty people are dead, including the gunman, and 53 others were injured in the attack. 
 
 Mateen, of St. Lucie County, Florida, was an American citizen with Afghan parents. Mateen's ex-wife told ABC News that he was a "sick person" and was abusive to her in their marriage. 
 
 Samuel Corum/Anadolu Agency/Getty Images 
 
 Many Florida Muslims have responded to the Pulse shooting with condemnation. 
 
 President Obama addressed the Orlando attack today in a speech, saying a unified America will defeat the threat of ISIS. 
 
 Our diversity and our respect for each other,” Obama said, pausing for emphasis. “That’s what makes this country great.” 
 
 The FBI told reporters Monday that Mateen spoke with police three different times from the club during the attack, which started at about 2:30 a.m. on Sunday. He called and hung up, called again and spoke with a dispatcher. The dispatcher then returned his call, according to the FBI. 
 
 Mateen was "cool and calm" during their conversations, according to police, and didn't make any demands. Survivors of the attack, however, said they heard Mateen say he wanted America to "stop bombing ISIS in Syria". 
 
 Gerardo Mora/Getty Images 
 
 In his phone exchange with police, Mateen pledged allegiance to the terror group ISIS and referenced the 2013 Boston Marathon bombers, Tamerlan and Dzhokhar Tsarnaev, officials said. He also referenced U.S. suicide bomber Moner Abusalha. 
 
 The FBI said in a statement Monday that Mateen had been interviewed by authorities in 2014 because of alleged ties to Abusalha, the son of a Palestinian father and American mother, who died on May 24, 2014, at the age of 22. Abusalha drove a truck packed with explosives into a government outpost in Syria, detonating the charge. 
 
 Omar Mateen's father, Saddique Mateen, told ABC News that he saw his daughter-in-law Noor Mateen overnight -- the first time since attack -- and confirmed that she had been interviewed by police along with other family members. He said he did not have knowledge of her involvement in his son's attack. 
 
 He also said that he did not believe that his son was gay, and any use of gay dating apps or visits to gay clubs were likely part of the planning for his attack. Saddique Mateen said he had spoken with his grandson, a toddler, on the phone for first time since Sunday. 
 
 The boy was asking for his father, he said.
– Whispers of another person being charged in the Orlando nightclub attack have been circulating, and that person may have been someone very close to him: his own wife. NBC News reports that the FBI is considering charges against Noor Mateen, the second wife of gunman Omar Mateen, because she may have known about the attack beforehand. She reportedly told federal agents that she tried to dissuade her husband from carrying out the ambush at Pulse nightclub. Noor Mateen—also IDed as Noor Zahi Salman by the New York Daily News—told the FBI she drove her husband to Pulse on at least one previous occasion so he could check it out, reports ABC News. Noor also told agents she was with him when he loaded up on ammo and a gun holster, officials familiar with the case say. CNN adds info that suggests Omar Mateen may have had an alternative target on his radar: Disney security officials have told the FBI they believe the Mateens visited Disney World in April, per a law enforcement official—though it's not clear if Noor knew of her husband's attack plans at that time—and that Omar Mateen made additional trips to the Disney Springs entertainment and shopping complex in early June in possible surveillance operations. Mateen also had a 3-year-old son and had been married one other time, a reportedly abusive marriage that ended in divorce.