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.

Authorities say a man wielding a folding knife randomly stabbed 11 people near a checkout counter at a Walmart in Traverse City, Michigan.

TRAVERSE CITY, Mich. (AP) — Multiple people were stabbed at a Walmart in Traverse City, and a suspect is in custody, authorities said Saturday. The Michigan State Police said the local sheriff’s office is investigating the incident and details are limited. The agency asked that people avoid the area while the investigation is ongoing.