People walk in and out of a Walmart store, in Dallas. Walmart announced new moves on October 9, 2017, to speed up the return process for online purchases, including letting some shoppers keep the stuff they don’t want and still get a refund, August 26, 2016. (Photo: AP)

HOUSTON (Xinhua) -- Three people were killed in a shooting at a Walmart store in Duncan, U.S. state of Oklahoma, on Monday morning, according to local media citing the Oklahoma Highway Patrol.

Duncan police have confirmed that three people were dead, including the suspect. But the suspect has not yet been identified, according to reports from The Duncan Banner, a local newspaper.

Duncan is about 130 km southwest of Oklahoma City, the capital city of Oklahoma.