By Matt Boone on October 31, 2007 at 2:21 PM EST

Din Thomas, well-known in the Ultimate Fighting Championship world, was arrested Tuesday after police say he ran "illegal cage fighting" matches at a local training studio that he runs.

Thomas, 31, faces a felony prohibited competitions charge after police got a tip Oct. 19 about the matches at a facility he uses in St. Lucie West.

Inside, they observed two men fighting in an octagon-shaped ring surrounded by about 150 spectators. The fights reportedly weren't sanctioned.

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MMASCOOPS.com - Din Thomas **MUG SHOT** Revealed - He's CRYING - HAHAHA!!