The authorities on Sunday said that a motive for the attack, which left 11 people injured, remained unknown. Citizens, including one who was armed, helped to apprehend the suspect, officials said.

A 42-year-old man is facing charges of terrorism and assault with intent to murder after 11 shoppers were stabbed at a Walmart supermarket in the US state of Michigan. The assailant used a folding knife to stab five men and six women, including a Walmart employee, on Saturday afternoon in Traverse City.