SOLEBURY TWP., Pa. -- The Bucks County district attorney said several pieces of evidence have been recovered amid the search for four missing men.
D.A. Matthew Weintraub said during a news conference on Wednesday morning that the evidence was recovered at the farmland in Solebury Township that has been the focus of a massive search this week.
"We have recovered several important pieces of evidence at this site that we're currently working very hard on - with the majority of our manpower - and at other locations," Weintraub said.
Weintraub said that no human remains have been found.
VIDEO: D.A. Weintraub update on Wednesday morning
When asked if the evidence leads him to believe the remains of the four men were on the property, Weintraub simply said investigators are going to "continue in the direction that we're going."
"This is just really, really rough on everybody involved because of the heat, the magnitude, the scope, and the stakes are incredibly high... life and death," Weintraub said.
The search for the four missing men stretched into its fourth day on Wednesday.
Video from Chopper 6 showed a search area with sections dug up by heavy equipment. Tents covered portions of the scene. Sources tell ABC News that a ping from one of the missing men's cellphones led investigators to the property.
A person of interest in this case, 20-year-old Cosmo DiNardo, posted 10% of $1 million bail on Tuesday evening after his arrest the day before on unrelated charges.
PHOTO: Cosmo DiNardo
He was charged with a firearms possession offense from February.
It is not known where DiNardo went after being released from the Bucks County jail, as he did not return to his family's home in Bensalem.
VIDEO: Person of interest posts bail
During a news conference on Tuesday, Weintraub stressed that DiNardo is not being called a suspect at this time.
"Sometimes the chasm between a person of interest, and being a person that is actually accused or arrested, and certainly convicted of a crime, is so wide that we never cross it," Weintraub said.
VIDEO: D.A. Weintraub holds press conference
According to an affidavit of probable cause obtained by Action News, DiNardo was accused of possessing a shotgun and ammunition despite a history of mental illness that includes an involuntary commitment.
The charge had been dropped, but was refiled Monday. Weintraub said bail was set high over concerns that DiNardo might be a flight risk.
DiNardo was taken into custody at the Bensalem home in the unit block of Wayland Circle. It was one of the multiple locations being searched by authorities on Monday.
His family also owns a property on Aquetong Road that was searched on Sunday, and a farm on Lower York Road near Route 202 in Solebury Township where an active search continues.
VIDEO: Friends, neighbors seek answers in Bucks Co. missing men case
Weintraub said the search at the DiNardo property is massive and involves major construction equipment, fine sifting equipment and cadaver dogs.
"We are still gradually sifting through the property," Weintraub said. "It's 90-some acres and we're going through it with the equivalent of a fine-tooth comb. It's going to take us a very long time."
The four missing men are identified as Mark Sturgis, 22, of Pennsburg; Tom Meo, 21, of Plumstead; Dean Finocchiaro, 19, of Middletown Twp.; and Jimi Tar Patrick, 19, of Newtown.
PHOTO: Identities of missing men
Bucks County District Attorney Matt Weintraub said he believes foul play is involved.
"I sure believe there is," he said during a news conference on Monday afternoon.
The FBI has joined the investigation. Weintraub said the leads in this case are "very hot."
VIDEO: Search scene in Solebury Twp. on July 11
"We've been treating this from the outset as a criminal investigation, and nothing has deterred that to this point," Weintraub said.
But when asked why he believes foul play was involved, he said it was due to "information that I know that I can't share."
Sturgis, Meo and Finocchiaro were last seen on Friday, July 7. Patrick was last seen on Wednesday, July 5.
Weintraub said it is believed all four men know each other, but investigators are working to confirm that information.
Weintraub said while "tons" of tips have come in, investigators continue their plea to the public for more information.
"What we're looking for is information that connects these four men together, that may connect them to the property we're searching, connect them to Cosmo DiNardo, perhaps," he said. "I can't say if there is that type of information, but if there is, I beg of you to please give it to us and let us run it down."
"Hope and pray for the best"
People who know the four missing men say all they can do now is hope for the best.
Jennifer Albrecht is a bartender at the Candlewyck in Doylestown, where Jimi Patrick works as a beer-runner.
She says Jimi is one of the nice guys.
"He was on the shyer side, but you would get a smile out of him, a little conversation," she said.
Albrecht says the irony is how this shy, soft-spoken young man is now at the center of most conversations at the bar.
"Everybody's talking about it. Everybody just wants to find all four of the men that are missing," Albrecht said. "Hope and pray for the best. For all of them."
Anyone with information is asked to contact investigators at 215-297-8201.