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Nikolas Macko was in a mathematics class in Norris Hall when they heard a series of loud bangs in the hallway which prompted a female student sitting near the door to move to close it.

"She peeked out into the hallway, and saw the shooter, so she immediately closed the door. Three other students moved a table that was in front of the room - it seats approximately 40 students at capacity - and barricaded it against the door.

"A few seconds later, the shooter tried to open the door, but my classmates kept it well shut, as they held the table against it from floor level.

"The shooter shot the door twice at chest level, which resulted in two holes in the door, one of which hit the podium in the front of the class room and the other continued out the window. At this point he reloaded, shot the door again - this shot did not penetrate - and moved on to the other classrooms," Mr Macko added.

From BBC.

http://news.bbc.co.uk/2/hi/americas/6560685.stm