The area had been in the grips of panic after four men disappeared in the span of three days last week.
"We're going to see this investigation to the end", Weintraub said, "We're going to bring each and everyone of these's lost boys homes to their families, one way or another".
Authorities on Wednesday arrested the son of the property's owners, 20-year-old Cosmo DiNardo, on charges that he tried to sell one of the missing men's cars a day after he was last seen.
Cosmo DiNardo was being held on $5 million cash bail after he was charged with trying to sell another victim's vehicle after he disappeared. But the prosecutor continued to stop short of calling him a suspect.
Human remains found in search for 4.
No one has been charged in Finocchiaro's death or the disappearance of the other men.
At least some of the victims were friends, but it is not clear how well they knew DiNardo, if at all. It is unclear whether Patrick knows any or all of the men, but Patrick and DiNardo appear to be Facebook friends. "This is a homicide, make no mistake about it", Weintraub told reporters early Thursday. He was released from Bucks County jail on Tuesday night after 10 percent of his $1 million bail was paid by his father.
Dinardo was prohibited from possessing a firearm because he had a mental illness and had been involuntarily committed to a mental institution for inpatient care, court documents said.
A man authorities have called a person of interest in the search for four missing Pennsylvania men has been re-arrested, this time for allegedly stealing and trying to sell a vehicle belonging to one of the missing men.
DiNardo's family owns the farm. where the investigation continues.
Leading into their search for the missing men, the Federal Bureau of Investigation used heavy equipment digging a deep ditch on the farm property, sifting through each bucket of dirt by hand.
The body found in the 12 1/2 foot common grave on Wednesday was identified as Dean Finocchiaro, 19.
While he said he doesn't understand the science behind it, the cadaver dogs could smell the human remains buried so deeply in the ground.
At a media briefing, Weintraub said he believed the property was a crime scene, based on information that couldn't be released to the public yet.
- royAndrew️ (@r0y_monster) July 13, 2017The four boys determined missing are: Dean Finocchiaro, 19, Thomas Meo, 21, Jimi Tar Patrick, 19, and Mark Sturgis, 22.