Video shows an armed bystander confronting a knife attacker who allegedly injured 11 people at a Walmart in Traverse City, Michigan, on Saturday.

Anyone with information, photos or videos in connection with the attack is asked to contact the Grand Traverse County Sheriff's Office.

"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.

A group of bystanders, including a man armed with a firearm, rallied together to help stop a suspect who stabbed 11 people at a Walmart in Traverse City, Michigan, on Saturday. (Chris O'Brien via Stor

Stabbing suspect Bradford James Gille was subdued within minutes with the help of bystanders, authorities said.

A dramatic video shows the moment heroic bystanders confronted a mass-stabbing suspect at a Walmart in Traverse City, Michigan. A 42-year-old male, now identified as Bradford James Gille, reportedly entered the store and used a folding knife to stab several people,

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