“It appears that these were all random acts,” Grand Traverse County Sheriff Michael Shea said at a news conference.

Chaos unfolded at a Walmart in Michigan after a man burst into the store during a calm shopping afternoon and stabbed 11 people at random, authorities say.

“They didn’t wait. They didn’t run. They jumped in to stop it,” Shea told reporters. “They are absolute heroes. It could’ve been much, much worse.”