As night fell, scores of police in Lake County were continuing to search for three people believed to be responsible for fatally shooting a police lieutenant Tuesday morning, while residents of the small village he served mourned his death. 
 
 Despite a manhunt that besieged far north suburban Fox Lake all day, authorities said late Tuesday that no arrests had been made in the shooting death of Lt. Charles Joseph Gliniewicz, a 30-year-veteran known in local law enforcement for his work with aspiring police officers. Gliniewicz, known to many as "Joe," was married with four children, according to police and family. 
 
 He'd recently discussed retiring as soon as this month, said Fox Lake Mayor Donny Schmit. 
 
 "He's got four sons who are going to have to go on alone," said Terry Resetar, the fallen officer's mother-in-law. 
 
 Because of the ongoing search, several school districts in the area — Fox Lake District 114, St. Bede Catholic School, Big Hollow District 38 and Gavin District 37, along with Grant High School — all announced they will be closed Wednesday. 
 
 More than 100 officers were expected to continue searching overnight Tuesday for the suspects, described by police as three males, two white and one black. All day, officers from throughout the Chicago region, sweating in bulky tactical gear and toting high-powered rifles, combed the village of about 10,000 near the Wisconsin border. Helicopter blades pounded overhead as traffic froze and schools went on lockdown. 
 
 Courtesy of Lake County Sheriff's Office Fox Lake police Lt. Charles Joseph "Joe" Gliniewicz, 52, was a 30-year veteran of the department. Fox Lake police Lt. Charles Joseph "Joe" Gliniewicz, 52, was a 30-year veteran of the department. (Courtesy of Lake County Sheriff's Office) (Courtesy of Lake County Sheriff's Office) 
 
 Gliniewicz, 52, was on routine patrol around 8 a.m. when he radioed that he was responding to suspicious activity, according to the Lake County Sheriff's Office. He started a foot pursuit, but no one heard from him after that, authorities said. 
 
 His colleagues responded and found him shot in a marshy area near U.S. Highway 12, a main road through town, authorities said. His gun was found near him, said Lake County Undersheriff Raymond Rose. Gliniewicz died at the scene, Rose said. 
 
 The offenders should be treated as armed and dangerous, Rose said. He said police were working with "limited descriptions" of the suspects. 
 
 Known to some as "G.I. Joe," the trim, muscular, tattooed Gliniewicz had served in the Army, according to his Facebook page. He was known locally for his work with Fox Lake's police Explorers program, which gives youths who aspire to careers in law enforcement an up-close experience. 
 
 "He, as the leader of that, had a tremendous impact on a lot of young people in the county," Rose said. 
 
 CAPTION The gunshot that killed Fox lake Lt. Charles Joseph Gliniewicz was to his torso, Lake County Coroner Thomas Rudd said Thursday. Sept. 10, 2015. (WGN-TV) The gunshot that killed Fox lake Lt. Charles Joseph Gliniewicz was to his torso, Lake County Coroner Thomas Rudd said Thursday. Sept. 10, 2015. (WGN-TV) CAPTION The gunshot that killed Fox lake Lt. Charles Joseph Gliniewicz was to his torso, Lake County Coroner Thomas Rudd said Thursday. Sept. 10, 2015. (WGN-TV) The gunshot that killed Fox lake Lt. Charles Joseph Gliniewicz was to his torso, Lake County Coroner Thomas Rudd said Thursday. Sept. 10, 2015. (WGN-TV) CAPTION The Fox Lake officer killed last week died from a single gunshot wound, according to the Lake County coroner. (WGN-TV) The Fox Lake officer killed last week died from a single gunshot wound, according to the Lake County coroner. (WGN-TV) CAPTION No evidence on manner of Fox Lake Lt. death at this time according to Lake County coroner. Sept. 9, 2015. (WGN-TV) No evidence on manner of Fox Lake Lt. death at this time according to Lake County coroner. Sept. 9, 2015. (WGN-TV) CAPTION Internal investigation into Fox Lake police department raises questions. Sept. 9, 2015. (CBS Chicago) Internal investigation into Fox Lake police department raises questions. Sept. 9, 2015. (CBS Chicago) CAPTION The Fox Lake officer killed last week died from a single gunshot wound, according to the Lake County coroner. The Fox Lake officer killed last week died from a single gunshot wound, according to the Lake County coroner. 
 
 Fatal shootings of police in Illinois have been relatively rare, and Gliniewicz is the first on-duty officer fatally shot in Lake County since 1980, said State's Attorney Mike Nerheim. 
 
 Homicides are rare in Fox Lake; the agency didn't report any murders to the state in several recent years, according to data kept by the Illinois State Police. 
 
 The manhunt interrupted life around Fox Lake and well beyond the village, as roads closed, police advised residents to stay inside and Metra trains halted. Many schools in the area went on lockdown, with police and school administrators choreographing the release of students to parents who waited on clogged local roads to pick them up. 
 
 Michael Drewer, 35, of Fox Lake, owner of DipStick Oil Change, arrived at work to find swarms of police blocking off roads. 
 
 "They checked our security video and then told me I wouldn't be doing any business today," Drewer said. 
 
 Flags flew at half-staff outside the Police Department after the shooting, and Gina Mariea stood along Route 12 near the shooting scene with a sign that said, "Police Lives Matter." Her teenage son served under Gliniewicz in the Explorers program, and the officer was a mentor to him, she said. 
 
 "I'm out here because this is my town, this is my community and I'm supporting law enforcement," Mariea said. "My son is on lockdown (at Grant Community High School) right now, otherwise he'd be with me." 
 
 During the day, police went door to door seeking the suspects. As night fell, some 40 police dogs and their handlers were searching for the suspects while helicopters equipped with heat sensors scanned the area, Rose said. 
 
 After dark, much of the searching was being done by helicopter, he said. 
 
 Several hundred police from agencies as far away as Joliet helped with the manhunt, Rose said. That was important, he said, so police could cycle in and out of the hunt. Several officers were taken by ambulance from the scene after being overcome by sweltering heat, Rose said. Others were treated at the scene. 
 
 "Every major law enforcement agency you can think of," assisted on-site or remotely, Rose said, citing the Bureau of Alcohol, Tobacco, Firearms and Explosives; FBI; and Secret Service. He lamented the need for police to respond to the shooting of one of their own. 
 
 "We can't keep going like this," he said. "We can't keep doing this." 
 
 Dan Hinkel is a Chicago Tribune reporter; Dan Moran and Frank Abderholden are News-Sun reporters. Lisa Black, Jim Newton, John Keilman and Lauren Zumbach of Tribune Newspapers and freelancer Amanda Marrazzo contributed. 

 FOX LAKE, Ill. (AP) — Police with helicopters, dogs and armed with rifles were conducting a massive manhunt in northern Illinois on Tuesday after an officer was fatally shot while pursuing a group of men. 
 
 Police officers patrol a swampy area in Fox Lake, Ill., during a manhunt after an officer was shot and killed while pursuing a group of suspicious men, Tuesday, Sept. 1, 2015. Authorities in Fox Lake,... (Associated Press) 
 
 A police helicopter patrols a swampy area near route 59 and Rollins in Fox Lake, Ill., where a manhunt is in progress after an officer was shot on Tuesday, Sept. 1, 2015. Lake County Major Crimes Task... (Associated Press) 
 
 Police officers patrol a swampy area in Fox Lake, Ill., during a manhunt after an officer was shot and killed while pursuing a group of suspicious men, Tuesday, Sept. 1, 2015. Authorities in Fox Lake,... (Associated Press) 
 
 This undated photo provided by the Fox Lake Police Deptartment shows Lt. Charles Joseph Gliniewitz, who was shot and killed Tuesday, Sept. 1, 2015, in Fox Lake, Ill. Police with helicopters, dogs and... (Associated Press) 
 
 Police officers gather before heading out for a manhunt after an officer was shot in Fox Lake, Ill., on Tuesday, Sept. 1, 2015. Lake County Major Crimes Task Force Cmdr. George Filenko says an officer... (Associated Press) 
 
 An emotional Fox Lake Mayor Donny Schmit described the slain officer, Lt. Charles Joseph Gliniewitz, as a personal friend, a three-decade member of the department and a father of four sons. 
 
 "We lost a family member," Schmit said of the 52-year-old officer known around town as "GI Joe." ''His commitment to the people of this community has been unmatched and will be dearly missed." 
 
 Authorities said Gliniewitz radioed in to tell dispatchers he was chasing three men on foot in the village of Fox Lake, 55 miles north of Chicago. Communication with him was lost soon after, said Lake County Sheriff's Office spokesman Sgt. Christopher Covelli. 
 
 "His backup arrived shortly thereafter and found him injured with a gunshot wound," Covelli said. "The officer has succumbed to his injuries and passed away." 
 
 Undersheriff Raymond Rose told the Chicago Tribune that the officer had also been stripped of his gun and other equipment. 
 
 Less than an hour's drive from Chicago, the area is popular with boaters and for other outdoor pursuits because of its forest preserves and a chain of lakes that partly encircles Fox Lake. Some longtime city dwellers move to the region for what is normally a quieter lifestyle. 
 
 Police and other law enforcement officials, some of them in military-style camouflage, were seen taking up positions on rooftops and along railroad tracks, scanning the terrain with rifle scopes and binoculars. Others leaned out of helicopters with weapons at the ready. 
 
 Nearby Grant Community High School was placed on lockdown with children and staff instructed to say hidden and away from windows, and Schmit said that other schools were also put on lockdown, as staffers went from room to room to make sure the children were safe. 
 
 Authorities urged residents throughout the area to stay home while they conducted the search for three men, two of them white and the other black, using bloodhounds on the ground and helicopters above. 
 
 The service of a local commuter train was halted and residents who wanted to take their dogs out to relieve themselves were told to stay in their homes — with the job of walking the dogs handled by police officers. 
 
 Gliniewicz's death is the third law enforcement fatality in Illinois this year, according to the Law Enforcement Officers Memorial Fund. It says firearms-related deaths in the U.S. are down 13 percent this year compared to the same period last year, Jan. 1. to Sept. 1; there were 30 last year and 26 this year. 
 
 Around Fox Lake, residents expressed their own sorrow over the death of the immensely popular Gliniewitz. 
 
 "This particular officer is a pillar in my community and definitely going to be missed, and (he) touched so many lives," said Gina Maria, a 40-year-old teacher who lives in the community. 

 Schools have been closed in Fox Lake and several surrounding school districts Wednesday as the manhunt continued into the night for three armed and dangerous men who are believed to be responsible for killing a veteran officer Tuesday morning. NBC 5's Dick Johnson reports. (Published Tuesday, Sept. 1, 2015) 
 
 A massive manhunt raged into the night Tuesday for three men on the loose who authorities say gunned down a Fox Lake police officer. 
 
 Authorities say search crews will continue around the clock to find the suspects who are believed to be responsible for the killing of Lieutenant Charles "Joe" Gliniewicz, a 30-year-veteran of the police force. 
 
 "Search teams will work 24/7 to apprehend [the suspects]," said Joe Ahern, CEO of the 100 Club of Chicago, late Tuesday. 
 
 In addition to the Lake County Sheriff’s Office and Fox Lake Police Department, search teams include numerous local law enforcement officers from northern Illinois, Illinois State Police, and federal agencies, according to officials. Multiple local and federal SWAT Teams, 48 canine units, and six air support units were also dispatched for more than 14 hours Tuesday. 
 
 Massive Manhunt Continues for Men Who Gunned Down Fox Lake Officer 
 
 A massive manhunt is still underway for three dangerous armed men who authorities say are responsible for killing a veteran police officer. NBC 5's Charlie Wojciechowski. (Published Tuesday, Sept. 1, 2015) 
 
 Fox Lake and several surrounding districts canceled school for Wednesday in response to the ongoing search. The local school districts include Grant Community High School, Fox Lake, Gavin, Big Hollow, and Saint Bede Catholic School. 
 
 "As a result of those reports and deliberations, we have all decided that it is in the best interests of our students, the community, and law enforcement, to cancel school for tomorrow, Wednesday, September 2, 2015," school officials said in a statement just after 10 p.m. 
 
 Gliniewicz, who went by "Joe" and was affectionately called "G.I. Joe" by residents, dedicated his life to serving his community. He leaves behind a wife of 30 years, Melodie, and four sons. 
 
 One neighbor told NBC Chicago they saw Gliniewicz leave for work at 6 a.m. Tuesday. Just two hours later he was viciously shot to death. 
 
 Just after 8 a.m., Gliniewicz was called to investigate three suspicious suspects near Route 12 and Sayton Road in north suburban Fox Lake. Upon arrival, Gliniewicz was led on a foot pursuit by the men, according to Detective Christopher Covelli with the Lake County Sheriff's office, and soon after used his radio to call for backup. 
 
 A responding backup officer found Gliniewicz in a marshy area with a gunshot wound. Gliniewicz died soon after from his injuries. 
 
 The 52-year-old officer was on the cusp of retirement when he was killed, according to Ahern of the 100 Club of Chicago, who says Gliniewicz planned to retire last month but the police chief asked him to stay one extra month to help out. 
 
 The gunmen are described as two white men and one black man, but further details on their descriptions have not been made available. 
 
 Governor Rauner’s office released a statement saying he "extends his deepest condolences to the family of Officer Gliniewicz." 
 
 Chief Doug Larsson with the Lake County Sheriff's office said the department, along with several other suburban departments, are using canines and helicopters to search for the suspects. The suspects are armed with a pistol, Larsson said. 
 
 During an 11:30 a.m. press conference residents in the area were told to stay indoors and report any suspicious activity as the investigation continued. 
 
 “As information continues to come in about the shooting of another police officer in the line of duty in Fox Lake, I hope we can all remain calm and pray for the officer’s family and the other officers in harms-way right now," State Rep. Barbara Wheeler said in a statement. "Eleven police officers have needless lost their lives since Aug. 20th alone in America because of shootings and sadly our communities have been directly impacted today.” 
 
 As the manhunt began after the shooting, Grant Community High School in Fox Lake was put on a temporary lockdown. The school said a "police matter is occurring in the community and for the safety of our students and staff they have requested we remain locked down." 
 
 Roads in the area were blocked off as police can be seen searching wooded areas with dogs. 
 
 Authorities are said to be using a grid system to cover the area in the manhunt.
– Police north of Chicago continued to hunt for three men accused of murdering a police officer this morning. The slain officer has been identified as Lt. Charles Joseph Gliniewitz, 52, a 30-year veteran of the Fox Lake police force and a father of four. "He's got four sons who are going to have to go on alone," his mother-in-law tells the Chicago Tribune. Gliniewitz's last communication came about 8am when he said he was chasing three suspicious men, two white and one black, on foot. Another officer who followed up found his body in a marshy area, his gun and other gear stolen. He died at the scene from a gunshot wound. "We lost a family member," said Fox Lake Mayor Donny Schmit, who added that the officer known as "GI Joe" was a personal friend, reports AP. The manhunt still underway is "massive," reports NBC Chicago, with helicopters patrolling overhead as canine units, US marshals, and SWAT teams in camouflage comb the wooded area. "This particular officer is a pillar in my community and definitely going to be missed, and (he) touched so many lives," says a teacher in Fox Lake, about 55 miles north of Chicago.