(CNN) -- Three men have come forward to say they were sexually abused by convicted former Penn State assistant coach Jerry Sandusky as early as the 1970s, sources close to the case told a Pennsylvania newspaper.
Sandusky was convicted in June of sexually abusing 10 boys in cases dating back to the 1990s. Two sources with knowledge of the investigation said police are aware these men have come forward, and one has already contacted investigators, the Harrisburg Patriot-News reported Monday.
Their allegations are the first to accuse Sandusky of molesting boys before the 1990s, when the cases prosecutors brought against him took place. If found credible, they would directly attack the 68-year-old's defense argument that a person doesn't become pedophile in his or her 50s.
In the early 1970s, when one of the men says he was abused, Jerry Sandusky would have been in his late 20s.
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Former Penn State assistant football coach Jerry Sandusky leaves the Centre County Courthouse in handcuffs after a jury found him guilty in his sex abuse trial on Friday, June 22.
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The podium stand outside of Jerry Sandusky's trial on its first day is covered in mics, hinting at the massive media coverage of the event.
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Sandusky could face hundreds of years behind bars at his sentencing on 45 counts in September. As his jury was deliberating, more accusers -- including his own adopted son -- raised allegations of abuse.
The grand jury investigation that led to Sandusky's November arrest is still meeting and could be hearing from more potential victims, but the Pennsylvania attorney general's office has not said if more charges will be filed.
Nils Frederiksen, a spokesman for the agency, said he couldn't discuss "any specific evidence" because of the grand jury probe.
"Court filings have indicated that new information has come forward and we're continuing to pursue, but can't talk about specific evidence."
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Lt. Mark Argiro of the State College Police Department said that he is "unaware of any investigations" of new allegations towards Sandusky, while Sandusky's lawyer did not respond to a request for comment from CNN.
It was not known whether the new accusers were contacted or interviewed by the team led by former FBI Director Louis Freeh, who delivered a scathing internal review of Penn State's handling of the case last week. Freeh's report does not mention any victims before the 1990s, and when asked Thursday whether he looked for anyone molested before that period, he simply responded, "Yes." He did not say what his investigators found.
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CNN's Julia Greenberg contributed to this report.
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Sandusky is escorted in handuffs to a police car at the Centre County Courthouse under the glare of TV lights. The jury found Sandusky guilty on 45 of 48 counts.
Defense attorney Joe Amendola talks to the media after the trial.
Matt Sandusky, one of Jerry Sandusky's six adopted children, said Thursday through his attorney that he also was sexually abused and was prepared to testify.
Shadows of the media are seen outside the courthouse during the second day of deliberations. Jurors took 21 hours over two days to convict Sandusky on 45 of 48 charges against him.
Sandusky's attorney Joe Amendola arrives at the courthouse Friday. After the conviction, Amendola announced plans to appeal despite the mountain of convictions against his client.
Prosecutor Joseph E. McGettigan III, second from left, and the rest of his prosecution team arrive at the courthouse Friday.
Sandusky faces the cameras as he is led to a sheriff's vehicle in handcuffs after the reading of the verdict.
Sandusky is put into a police car.
Sandusky was booked into the Centre County Correctional Facility.
Several news vans pile up outside of the Sandusky trial. The network satellite vans are all parked in front of the Centre County Courthouse and the vans parked in back are live trucks from the regional news outlets.
Every day Sandusky arrived in the passenger seat of his attorney Joe Amendola's black BMW SUV.
This sign posted on a road near the town of Bellefonte, Pennsylvania, shows support for former Penn State head football coach Joe Paterno.
Mic cords abound as the media took over the courthouse lawn to cover the Jerry Sandusky trial.
The grave of Joe Paterno is at Spring Creek Presbyterian Cemetery in State College, Pennsylvania.
Reporters wait with microphones outside of the Sandusky trial.
Several photographers and videographers staked out spots behind the police's green barriers in the back of the courthouse where Sandusky's trial was taking place.
Live vans from regional news outlets fill the lot behind the Centre County Courthouse where the Sandusky trial is taking place.
Judge John M. Cleland is presiding over Sandusky's trial at the Centre County Courthouse in Bellefonte, Pennsylvania
A business advertises Joe Paterno items within view of the courthouse where assistant coach Sandusky is on trial.
The gate to the practice football field is locked at the Mildred and Louis Lasch Football Building at Penn State University in State College, Pennsylvania
Mics and cameras surround the podium ouside the courthouse where Jerry Sandusky is on trial.
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