(WBRE) A Wilkes-Barre, Pennsylvania police officer is under arrest and facing charges of rape and sexually assaulting four women while on duty.

Robert Mathew Collins was arrested late Tuesday afternoon after a lengthy investigation into misconduct.

Collins is facing charges Rape, Involuntary Deviate Sexual Intercourse, and Intimidation of Witnesses among other charges.

According to court documents, there are four victims and the incidents happened over a 16 month period from August 2013 through December 2014.

The case is being investigated by Pennsylvania State Police and the FBI.

Read more on WBRE's website.