CHICAGO (CBS) — Sources say that four Chicago police officers who were stripped of their police powers this week allegedly claimed credit for an arrest they didn’t make.

The four officers are the focus of an internal police investigation and were placed on desk duty on Wednesday. Sources said Friday that the four officers claimed in court that they made an arrest they did not actually make, which could expose them to perjury charges.

Police at a local university are the ones who actually made the arrest, sources said.

The officers are all from the same district. They’ve been placed on administrative duty and the police Internal Affairs Division is leading the investigation.

The Internal Affairs investigation is a noteworthy distinction because that means the probe started within the police department, not a civilian complaint, which would be handled by the Independent Police Review Authority.

This comes just two weeks after a Chicago police sergeant and four officers were removed of their duties over allegations of police brutality.

Sources say this case is not related to that one.

Watch & Listen LIVE