PHILADELPHIA—A former Philadelphia police officer and a current officer are facing federal charges in connection with a lewd conduct investigation.

Former police Officer Joseph Harvey and Officer Sean Cahill were arrested Wednesday.

Prosecutors say Harvey ordered a woman to undress before performing a sex act in front of her during an October 2009 drug raid. They allege Cahill lied to investigators that Harvey was never alone with the woman.

Harvey is charged with violating the woman's civil rights. The move comes a year after a Philadelphia judge threw out state charges against him because prosecutors took too long to bring his case to trial.

Cahill is charged with making a false statement to authorities. Commissioner Charles Ramsey said Cahill is suspended for 30 days with the intent to dismiss.