DALLAS, Texas (CBSDFW.COM) — An off-duty police officer shot and killed an attacker on Friday just a block away from police headquarters in Dallas.

Police say two construction workers saw a man in their fenced parking lot on Lamar Street around 9:30 a.m. While escorting the man from the lot, the suspect began attacking a male worker with a knife. A female employee began screaming for help and dialed 9-1-1.

Off-duty Dallas Police Sergeant Jackie Moore, who happened to be across the street, heard the screams and responded. The 15-year-veteran then shot and killed the suspect.

Investigators have not identified the deceased attacker or revealed a motive.

“The witnesses are sharing with us that the attack came without any motive, without any notice whatsoever,” said Major Jeff Cotner. “Hopefully, our victim will survive. We are very optimistic of that and then we’ll have an opportunity to talk to him and maybe we’ll get better understanding on it.”

North and southbound Lamar Streets were shutdown while detectives examined the scene.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

Latest News:

Top Trending:

More From CBS Dallas / Fort Worth

Drip Pan: CBS Local App
Drip Pan: Weather App

Watch & Listen LIVE