PHILADELPHIA — Philadelphia Police Commissioner Richard Ross said Tuesday that homicide detectives have not yet had a chance to question confessed Bucks County killer Cosmo DiNardo about his claims to prosecutors that he had killed two people in Philadelphia years before four men went missing in Bucks County.

“In order for us to lend any credence to (DiNardo’s claims), we have to talk to him directly, which we will do if we get that opportunity,” Ross told 6ABC. “When you’re dealing with someone who’s pathological like that, you don’t know where they’re coming from.”

No names of any possible victims have been reported publicly.

Two separate media reports in The New York Times and CBS3 quoted sources on Monday saying that DiNardo had made the claim to Bucks County authorities when he gave his confession last week in the killings of four missing men whose remains were found on DiNardo’s parents’ Solebury acreage.

Ross told the television station Tuesday that investigators are searching police files to match possible unsolved cases with anything DiNardo may have said. Ross said his investigators only have scraps of information with no details.

Last week, DiNardo’s friend Eric Beitz, 20, of Bensalem, told the Philadelphia Inquirer and Daily News that DiNardo had spoken before of “weird things of like killing people and having people killed” and that DiNardo seemed “mentally unstable.”

The bodies of the four missing men were recovered late last week from deep graves on the Solebury farm owned by Antonio and Sandra DiNardo. Prosecutors said the victims had been lured to the vast property, first by DiNardo, then by him and his cousin, Sean Kratz of Northeast Philadelphia, in what DiNardo described as drug deals gone bad.