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(Orchard Park, NY) -- Buffalo Bills running back LeSean McCoy was forced to leave practice on Wednesday with a hamstring injury. Head coach Rex Ryan said McCoy was being evaluated and didn't have any details about how it happened or the severity of the injury. McCoy has rushed for 587 yards and six touchdowns while adding a receiving score through six games this season. The 4-and-2 Bills travel to Miami this Sunday to play the Dolphins.