HOUSTON (AP) — Authorities say a man with an AR-15-style rifle ambushed three constable deputies outside of a Houston bar, killing one and wounded two others.

The Houston Police Department says one person was detained, but he's not believed to be the shooter.

Harris County Precinct 4 Constable Mark Herman says the deputies were working security jobs at the 45 Norte Sports Bar when two of them responded to a witness’ report of a suspected robbery outside the business around 2:15 a.m. Saturday.

The two deputies were trying to arrest someone when a man with an AR-15-style rifle shot them from behind.

Herman's office says the third deputy was shot when he came to help.

Technology Helping To Reduce St. Landry Sheriff’s Response Times

Heatstroke Is Still Of Concern For Kids & Cars

Things That You End Up With In Your Home

Why Louisiana Has The Second Worst School System