"I'm still sitting and grappling with the weight of realizing that it was kind of a life-or-death moment," said Julia Martell, who witnessed the stabbing, which wounded 11 people.

Authorities in Michigan say a man entered a Walmart in Traverse City on Saturday afternoon armed with a folding knife and stabbed 11 people before being stopped by shoppers and a sheriff's deputy. The attack began unfolding at 4:43 p.m., the Grand Traverse Sheriff's Office said in a statement posted online.