Inmates shoot video of their Mannequin Challenge INSIDE prison

The Alabama Department of Corrections is investigating how it was possible to film the clip.

A video has surfaced online from within a prison in Alabama showing at least 30 inmates doing the Mannequin Challenge.

The clip, posted to Facebook by an unknown user on November 13, was taken in an Alabama Department of Corrections dormitory and has been viewed more than 200,000 times.