I recall a girl going to visit her sister in another country, going to an underground rave with some friends. After the rave is crashed by the cops(I think), the girl finds herself in a sort of labyrinth. Chased by a creature I can't seem to recall anyhting but it reminded me of a minotaur(may not be close) which I think turned out to be her sister and friends screwing with her.. she, in the end I believe killed them all and the end of the movie was her leaving... Please help me... THANK YOU :)

Catacombs (http://en.wikipedia.org/wiki/Catacombs_%282007_film%29)