Authorities say an off-duty police officer in suburban Dallas was involved in a shooting that left one person dead and another injured.

Dan Reed, a spokesman for the Town of Addison, says the shooting happened Sunday evening. Reed says a preliminary investigation indicates the incident began when the officer from the adjacent town of Farmers Branch came across a crime in progress and intervened.

Reed says one person was killed and the other was taken to a hospital. The officer was not injured. No identities were released, and the condition of the injured person wasn't immediately known.

Addison police are investigating, and Farmers Branch police will review the officer's actions.