One of the two students who opened fire on a school in Denver has been identified as 18-year-old Devon Erickson.
Before officers arrived, one heroic student, Brendan Bialy, tackled one of the gunmen.
Bialy's father told the New York Times that 'two students entered the classroom and one pulled a gun out of a guitar case'.
He said 'his son and two friends tried to tackle the gunman but one of the boys was shot in the chest', according to the Times.
That account was corroborated by the father of one of the teenagers who was shot.
Fernando Montoya told The Denver Channel his son, who was shot three times but is expected to survive, told him a shooter produced a gun from a guitar case.