Reply #60: Now that you mention it I've never seen the malfunction confirmed

[Recursion]

It was based on the fact that he fired around 20 shots from a 33-round magazine and then attempted to change magazines with rounds still in the original one (at which point he was tackled).

He shot nineteen people, six of them fatally (a twentieth person was injured while beating the shooter with a folding chair) in something like 30 seconds.