“The caller claimed to have shot two co-workers, held others hostage, and threatened to shoot them. He stated that if the officers entered he would shoot them as well,” the Littleton Police Department said in a statement Wednesday afternoon.
Apparently “swatting” is a “prank” that’s been going on for a while now. It involves making a fake phone call that demands SWAT presence (usually done to live-streamers [on twitch]).
Here’s the best available video on this particular instance: