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.

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