PORT ST. LUCIE 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, a police spokesman said.

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.