The US Department of Justice has launched a probe into sexual abuse allegations that has rocked the Roman Catholic Church in Pennsylvania, according to a report Thursday.

Two people familiar with the investigation told the Associated Press that prosecutors last week served subpoenas on dioceses across the state.

US Attorney William McSwain is seeking evidence stashed away in files called “secret archives,” “historical archives” or “confidential files” and records related to the dioceses’ organizational charts, finances, insurance coverage, clergy assignments and treatment.

He also demanded a trove of other information — whether anyone in bishops’ ranks took children across state lines for illicit purposes, sent sexual messages on the phone or computer, instructed anyone not to contact police, reassigned suspected predators or used money or other assets in connection with the sex scandal.

The probe comes on the heels of a bombshell grand jury report in August that accused 301 “predator priests” of preying on young children in Pennsylvania for decades. The abuse allegedly was covered up by church leaders.

Only two priests were charged as a result of the grand jury investigation because the statute of limitations had passed.

Spokespersons for ­McSwain and the DOJ declined to comment.

Experts said federal prosecutors could bring charges under the Racketeer Influenced and Corrupt Organizations Act, or RICO, which has been used to take down members of the Mafia.

“If you were going to file a criminal RICO or a civil RICO, the decision is: How much of the leadership do you have to capture?” wondered David Hickton, a former US attorney in western Pennsylvania. “The bishops themselves are captains of ships, but the admiral is the pope.”

Hickton considered criminal or civil charges against the Altoona-Johnstown Diocese in 2016, but left before the investigation was completed. The diocese settled with his successor, signing a decree that agreed to certain reforms.

Pope Francis admitted that church leaders “showed no care for the little ones,” in a letter blasting “the atrocities.”

“With shame and repentance, we acknowledge … that we were not where we should have been, that we did not act in a timely manner, realizing the magnitude and the gravity of the damage done to so many lives,” the pope wrote in August.

The pontiff has called a meeting of the world’s leading bishops in February to address the scandal.

With Wires