Wrong Turn 5: Bloodlines (2013)

Five college friends go to a small West Virginia town to celebrate the Mountain Man Festival on Halloween where they unexpectedly hit a serial killer named Maynard, friend of three mutant cannibals: Three Finger, One Eye and Saw Tooth. The students and Maynard are all arrested by Sheriff Angela while later that night, the three cannibals attack the police station in order to save their friends as well as revenge for him.