ID this firearm

In this image from the Columbine shooting, what is the weapon the shooter closest to the camera is holding in his left hand? To my untrained eye it looks like an automatic weapon, but as far as I know the shooters didn’t have any automatic weapons.

It’s a Tec-9. A crappy semi-auto in 9mm that was illegally purchased by that woman (can’t recall her name) at a gun show, which also included a shotgun that they sawed the barrel off.

Yes, a Tec-9. It has used as a scare tool by anti-gun activists for a while, because it looks odd, I guess. But it’s laughable, because it’s a really crappy piece of machinery.

The quality of the mechanism which delivers the round is unimportant to the perp.

If it will do in a victim,intimidate a bank teller,frighten off an asailant or what ever the objective-------a hammer nd a nail is just as good as an S&W,Luger or a
PPk.

From what I understand, the older models of the gun could be modified to become fully automatic (in which case I guess you’d have a crappy submachine gun). Not sure if that was still the case by the time the Columbine shootings happened though.