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.

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

Police are seeking to charge 42-year-old Bradford James Gille with terrorism and assault with intent to murder charges after he allegedly stabbed 11 people in a Michigan Walmart store.

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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