Cosmo DiNardo, the Bucks County man who authorities called "a person of interest" in the disappearance of four men, has been arrested. Mark Sturgis, 22, and Tom Meo, 21, were reported missing late Sunday.
NBC Philadelphia reported that police are investigating whether a 20-year-old who was arrested Monday on gun charges from February is connected to the incident, though he is not now considered a suspect.
The person spoke to The Associated Press on the condition of anonymity because he was not authorised to publicly discuss details of the case against 20-year-old DiNardo, who was in custody.
Kratz, who DiNardo described as his cousin, had a hand in three of the four murders, according to officials.
While authorities said they're making progress in the search, Weintraub also said foul play is suspected in the disappearances.
So far, investigators said they have only been able to identify one set of remains - those of Finocchiaro.
Sturgis' father said Meo and his son went missing last week after being seen in the Solebury area, according to WPVI. A news conference with the Bucks County district attorney is scheduled for 2 p.m. eastern time.
According to a report by The Intelligencer based in Doylestown, Bucks County, DiNardo's defense attorney said Thursday his client confessed to his "participation or commission in the murders of four young men."
Weintraub continued to ask for the public's help in providing information on the missing men.
The area had been in the grips of panic after four men disappeared in the span of three days last week.
The investigation has centered on the sprawling farmland property in Solebury Township owned by Antonio and Sandra Dinardo, Cosmo Dinardo's parents.
Weintraub said Finocchiaro's remains were recovered from a 12 ½ foot grave "painstakingly dug" by investigators "with a lot of care so not to damage any potential evidence". His parents own the property being searched.
"I don't know how this is going to end up, unfortunately, but I am confident that we are going to get to the bottom of this", Weintraub said.
Jimi Patrick, Tom Meo, Mark Sturgis and Dean Finocchiaro all seemed to vanish without a trace after the Fourth of July, and investigators say all of the men knew each other in some way, including Cosmo DiNardo, the person of interest in the case.