WASHINGTON (WXIN/WAVY) – The man who hit Capitol Police officers as he crashed into a barricade and ran at officers with a knife Friday has been identified by law enforcement as 25-year-old Noah Green.

The attack left a veteran U.S. Capitol Police officer dead and another hospitalized. Authorities shot Green, who died after being taken to an area hospital.

Investigators were digging into his background and examining whether he had any mental health history as they tried to discern a motive.