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.

Medical officials reported positive recovery signs for the eleven people wounded in a Michigan Walmart stabbing spree, while questions remain about the suspect.

A 42-year-old man, a Michigan resident, entered the store and used a folding knife to stab the victims, the Grand Traverse County Sheriff's Office said.