Authorities say they've filed charges against a man accused of assaulting and trying to rape a woman last month on a Metro train outside the nation's capital.

Thirty-nine-year-old John Prentice Hicks of Washington, D.C., has been charged with attempted first-degree rape, first-degree sexual offense and second-degree assault in connection with the April 12 incident. He was extradited last week and ordered held without bond Monday.

Metro Transit Police say the woman awoke and was attacked by the knife-wielding suspect before he got off the train. Police say Hicks was arrested hours after the attack in Montgomery County, a Maryland suburb of Washington.

Montgomery County State's Attorney's spokesman Ramon Korionoff says surveillance footage at a Metro station helped identify Hicks as the suspect.