31 people have been killed and another 10 injured after a gunman went on the rampage at a US college campus.
The dead are believed to be mostly students at Virginia Tech in Blacksburg, a state university known for its demanding science and engineering curriculum.
One student was killed in a dormitory while others were shot in a classroom, said Virginia Tech police chief WR Flinchum.
The gunman - who was said by witnesses to have been carrying a large amount of ammunition - was also killed although police have not confirmed if he turned a gun on himself or was shot by marksmen.
President George W Bush said he is "horrified" at the news.
College president Charles Steger added: "Today the university was struck with a tragedy that we consider of monumental proportions. The university is shocked and indeed horrified."
The first reports of an incident came at around 7.15am (1115 GMT) in West Ambler Johnston Hall, a dormitory housing some 900 students. Most of the shootings occurred at another campus building, Norris Hall.
Student Matt Maroney said fellow students threw desks at a door and a teacher was shot in the arm.
He added: "He had an ungodly amount of ammo on him. He was just dressed in a vest filled with clips and started firing away at classrooms.
I will keep you updated.