Family members of four young men who went missing last week continued their grim vigil at a Bucks County farm Tuesday as prosecutors named 20-year-old Cosmo DiNardo, son of the farm’s owners, a “person of interest.” 
 
 Bucks County District Attorney Matthew Weintraub called the search the biggest investigation in county history, employing hundreds of local, state and federal law enforcement officers who have been combing the 68-acre property in Solebury Township since Sunday night. 
 
 Although he said “foul play” is suspected, Weintraub said no bodies have been found, and encouraged the public to continue sending in tips on the men’s whereabouts. 
 
 “I have hope and it’s very important to hang onto hope until there is no room left for it,” Weintraub said. 
 
 After spending a night in jail, DiNardo, of Bensalem in Lower Bucks, was released late Tuesday after his father posted $100,000 cash — 10 percent of the $1 million bail he’d been held on for what Weintraub called an “unrelated” weapons offense. 
 
 According to court records, Bensalem police learned Feb. 9 that DiNardo had a shotgun and ammunition despite a previous involuntary commitment to a hospital for mental illness, which prohibited him from owning a firearm. 
 
 The charge was dismissed by a district justice in May, though online records do not say why. Prosecutors refiled it Monday, and asked for the high bail due to DiNardo being a “flight risk,” Weintraub said. 
 
 DiNardo’s attorney, Michael Parlow, did not return a phone call. 
 
 Investigators are looking for 22-year-old Mark Sturgis of Pennsburg; 21-year-old Tom Meo of Plumstead Township; 18-year-old Dean Finocchiario of Middletown Township; and 19-year-old Jimi Tar Patrick of Newtown Township. 
 
 Finocchiario, Sturgis and Patrick went missing on Friday. Meo was last seen Wednesday. 
 
 Authorities said Tuesday they were trying to determine any relationship between DiNardo and the missing men. According to their Facebook profiles, DiNardo is friends with Patrick. 
 
 In naming DiNardo a “person of interest,” Weintraub stressed that he had not been charged with any crime connected to the men’s disappearance. 
 
 “I just want to make it crystal clear that he’s not been charged,” Weintraub said. “Sometimes the chasm between someone being a person of interest and being charged with a crime is so wide we never cross it.” 
 
 Joe Holden reports: Cadaver Dogs Used, Dirt Sifted In Search For 4 Missing Men Joe Holden reports: Cadaver Dogs Used, Dirt Sifted In Search For 4 Missing Men SEE MORE VIDEOS 
 
 Weintraub offered few details about DiNardo, who appears to have no criminal record but for a few traffic citations, online records show. His parents, who bought the Solebury property in 2005 and rent it to farmers, own DiNardo Bros. Materials in Bensalem, according to online records. 
 
 Weintraub said his investigators have “been in touch” with DiNardo’s family but declined to discuss their conversations. The DiNardos could not be reached for comment Tuesday. 
 
 On Tuesday, family members of the missing men came and went from the Solebury search site at 6071 Lower York Road, about 30 miles south of Easton. Some were escorted by victim advocates. All declined interviews. 
 
 About 50 Montgomery County police cadets joined the operation Tuesday morning, fanning out over the woods and cornfields that cover the property. Weintraub said crews are using everything from heavy construction equipment to hand tools to sift through evidence on the farm. 
 
 “Take the biggest [crime scene] you’ve ever seen and multiply it by about a million,” Weintraub said. “There is a mind-boggling amount of manpower at just this property alone.” 
 
 Weintraub said police are also looking for the men at other sites. On Monday, they searched DiNardo’s home in Bensalem, just outside Philadelphia. 
 
 Aerial news photos Tuesday showed investigators laying items on tarps near a cornfield. Weintraub declined to say what was found. 
 
 At a Tuesday morning news conference, Weintraub called a media report that investigators had found bodies at the Solebury property “irresponsible.” 
 
 “That’s simply not accurate. We have four families keeping a vigil. When they see something like that it’s very upsetting,” Weintraub said. 
 
 PHOTO GALLERY: The search for 4 missing men in Bucks County has ended with charges of homicide being field against Cosmo DiNardo and his cousin Sean Michael Kratz, both 20. 
 
 Weintraub said he will continue to hold news conferences on the search at least twice a day, and urged anyone with information to call 215-297-8201. 
 
 “We are getting a ton of leads and we are checking out each and every one. Keep them coming,” he said. 
 
 matt.coughlin@mcall.com 
 
 Twitter @coughlinreports 
 
 610-820-6564 

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 Two weeks before a 20-year-old man in suburban Philadelphia was named a “person of interest” in the case of four missing young men, prosecutors in Bucks County asked the police to arrest him on a previously dismissed felony weapons charge. 
 
 But the man, Cosmo DiNardo, was not arrested by the Bensalem Police Department on that charge until Monday, after the authorities had started scouring his family’s sprawling farm for any signs of the men who disappeared over two days last week. Mr. DiNardo was released from the Bucks County Jail on Tuesday evening after his father, Antonio DiNardo, paid 10 percent of his $1 million bond in cash, according to the county district attorney’s office. 
 
 For the fourth straight day on Tuesday, up to 50 people took part in a painstaking search on the farm — a vast property off a country road in Solebury Township, about 30 miles north of Philadelphia. The authorities brought in cadaver dogs and heavy construction equipment, including a backhoe, and led a careful examination of the land “not to miss the tiniest piece of evidence,” the county’s district attorney, Matthew D. Weintraub, said. 
 
 So far, the search had not turned up any human remains, but Mr. Weintraub declined to comment on whether other physical evidence connected to the missing men had been found at the site. Members of an F.B.I. evidence response team helped the local authorities search the property on Tuesday, said Carrie Adamowski, a spokeswoman for the bureau’s Philadelphia office.
– As the search for four missing young men continues in Pennsylvania, a 20-year-old man arrested on a weapons charge Monday has been confirmed as a "person of interest" in the case. Bucks County DA Matthew Weintraub says investigators are still trying to figure out the relationship between Cosmo DiNardo and the four men who vanished last week, the Philadelphia Inquirer reports. On Tuesday, as dozens of law enforcement personnel searched farmland belonging to DiNardo's parents, Weintraub said it was important to "hang onto hope" that the men would be found alive. "We have not recovered any human remains to this point," he told reporters. "But we continue to work very, very hard." Police say foul play is suspected in the disappearances of Jimi Tar Patrick, 19; Dean Finocchiaro, 18; Mark Sturgis, 22; and Tom Meo, 21. According to Sturgis' father, Meo's car was found at a DiNardo family property. DiNardo's arrest came two weeks after prosecutors asked police to arrest him on the weapons charge, which had previously been dismissed, reports the New York Times. He was found in February with a shotgun he wasn't allowed to possess because he had previously been committed to a mental institution. Weintraub says the charge is unrelated to the disappearances. DiNardo was released late Tuesday after his father paid $100,000 of his $1 million bond in cash, the Morning Call reports.