Chilling: 911 call released from beheading of woman at Oklahoma plant

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MOORE, Okla. - A frightening call for help came in within moments of the violent attack.

Employees of Vaughan Foods locked themselves in offices and closets as Alton Nolen allegedly embarked on a deadly afternoon rampage.

Investigators say the freshly fired employee had beheaded one female co-worker and was in the middle of attacking another when he was taken down with at least three gunshots.

Employees anxiously waited for an "all clear" from police.

Listen to the full 911 call below.