Former Penn State University assistant football coach Jerry Sandusky leaves the Centre County Courthouse in Bellefonte, Pa., Wednesday, June 20, 2012. The defense rested Wednesday without calling Sandusky to the stand. Closing arguments are set for Thursday morning. Sandusky is charged with 51 counts of child sexual abuse involving 10 boys over a period of 15 years. (AP Photo/Gene J. Puskar)

A witness interviewed by federal authorities claims convicted child molester Jerry Sandusky and a Penn State booster sexually assaulted boys on a private plane, according to an exclusive RadarOnline report.

U.S. Postal Inspectors interviewed the witness after opening a new investigation into whether Sandusky shared child pornography.

The witness, who "has a strong tie to the booster he is accusing," claims that Sandusky and the fundraiser abused two boys on a private plane in Pennsylvania, the site reported. RadarOnline's unidentified source doesn't know whether the two boys are among Sandusky's previously identified victims.

It remains unclear why the witness did not come forward during the trial against Sandusky, who was convicted on 45 counts related to the sexual abuse of 10 boys. Federal authorities are reportedly investigating the new claims, which remain uncorroborated.