A Walmart employee was helping a customer check out when she heard a warning that someone in the store had a knife.

Police are investigating a mass stabbing where a 42-year-old man entered the Walmart in Traverse City and used a folding knife to stab 11 people.

According to a probable cause affidavit, Riverton Police responded to the area of 5290 West and Elk Horn Peak Drive around 11:15 p.m. on a report of a stabbing. A witness told police that Dale Talbot, 42, had stabbed another man.

Multiple hurt in Walmart stabbing