GRAND RAPIDS, MI - Matthew Kolakowski had just left the Walmart checkout lane when a worker screamed that a man had a knife. Then, he heard a “mass wave of just blood-curdling screams from the back of the store.

Of the 11 people who were attacked, six remained in fair condition as of late Tuesday morning, while one was listed in good condition.

One of the men who authorities say helped take down a suspect who stabbed eleven people at a Walmart told NBC News about how he sprung into action. Marine veteran Matthew Kolakowski says he took off running after the suspect and rammed him with a grocery cart to prevent him from hurting more people.

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.