The U.S. Capitol was placed on lockdown Tuesday afternoon following what a least one reporter says was a shooting near the Department of Labor.

A machine gun?

Back up a minute … a machine gun?

Far too many people with little to no knowledge of firearms like to call semi-automatic rifles “machine guns,” so there are plenty of skeptics out there.

OK, smart guys. Police confirm that they recovered a MAC-11 subcompact machine pistol dropped in a tunnel during a getaway attempt. Really.

That’s insane. We’ll definitely be hearing more about this incident.

Update:

Here’s a still frame from a cell phone video that apparently shows one of the suspects being taken into custody.

Three people have been taken into custody.