Virginia tech gunman 'acting alone'
The gunman who killed a policeman and then himself at the Virginia Tech university campus was acting alone, state police have said.
Police spokeswoman Corinne Geller said the attacker ran from the scene where he shot the officer and changed clothes before shooting himself in a car park half a mile away.
Ms Geller told a news conference that the gunman, whose identity has not been released, put his clothes in a backpack and left it behind a greenhouse on campus.
She said investigators are still trying to find out why he ambushed the policeman, Deriek W Crouse, as he was carrying out a routine traffic stop.