Gunshots rang out Thursday in Texarkana, Ark., High School as police stormed a classroom and killed an armed man barricaded inside.

It was a training drill and the action was staged.

All 82 Texarkana, Ark., Police Department officers spent this week in tactical, “force on force” training to deal with real-life situations involving active shooters.

“An active shooter is when someone’s gone into an environment with a lot of people in it and they’re intentionally engaging those innocent people,” said Sgt. Mike McQuerrey. “They’re trying to hurt or kill as many ...