Nearly a dozen people were stabbed at a Walmart in Traverse City, Michigan, Saturday afternoon, in what police are calling a “random” act by a lone attacker. Six of the injured were still in critical condition hours later.

Michigan police say a man pulled out a knife inside a Walmart on Saturday and began stabbing customers, leaving 6 in critical condition and 5 in serious condition. The sheriff says a responding deputy apprehended the suspect within minutes but have not released the name of the attacker.