On Tuesday Evening during the 11 Pm Hour  , Billings Police Officers were dispatched to a report of a robbery at the Hilltop Station Casino located at 523 Hilltop in Billings Montana.   Two unidentified males entered the small casino which was occupied by one employee and two customers and robbed the casino at gunpoint.  One of the suspects approached the casino employee demanding money while the other suspect confronted the patrons of the casino.    The suspect who confronted the patrons hit one of the customers over the head with his handgun causing minor injuries.  The suspects fled the casino with an undisclosed amount of money.  The injured patron was treated by medical at the scene.  The suspects appeared to be middle age white males.  The incident is under investigation.