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.
DiNardo was prohibited from owning such a weapon, the document alleges, as he was "known to be suffering from a mental illness" following his involuntary commitment to a mental institution.
DiNardo faces four counts each of criminal homicide, conspiracy to commit criminal homicide, and abuse of corpse, as well as 12 other charges.
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If he were forced to step down, his ruling PML-N party could appoint a new leader as prime minister until the polls. Meanwhile, some banners, in support of the prime minister, have also surfaced in his home constituency.
DiNardo is now only being held on firearms charges but he is considered a suspect of interest in the disappearances of the four men.
The person with knowledge of the confession said one of the men was killed July 5 and the other three were killed July 7.
Bucks County District Attorney's Office photo of Cosmo DiNardo after his arrest on Monday.
The details were provided after one of DiNardo's lawyers said Thursday that DiNardo had confessed to killing the missing suburban Philadelphia men and told investigators where their bodies were located.
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Small caps posted a weak session, with Russell 2000 futures ending only slightly below the break-even line. US equities closed higher on Thursday as retailers rose, led by Target.
Although there are indications that some or all of the men knew one another, investigators are working to confirm that information and the extent of any connections, Weintraub said.
"We're going to see this investigation through to the end", said the district attorney.
Newtown Township, Plumstead Township, Middletown Township Police and state police are all involved in the joint investigation, Bucks County Assistant District Attorney Gregg Shore told ABC affiliate WPVI-TV.
Authorities said they've recovered several pieces of evidence from a sprawling farm property, and elsewhere, while investigating the disappearance of four young Pennsylvania men believed to be victims of foul play.
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The sinkhole was first reported as a depression around 7:56 a.m. on Friday morning, noted ABC News . Whited said the hole grew in a matter of minutes. "We're expecting it to grow", said Guthrie.
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