Grand Junction police are investigating an assault and robbery at the Graff Dairy on 29 Road. According to Sergeant Doug Norcross two employees were leaving the dairy after closing at eight p.m. Saturday when they were approached by two teenagers one male, one female. One of the suspects punched a female employee in the face then took off with a money bag full of cash. The victims tell police the suspects headed north toward Patterson Road. Police are still on the lookout for the suspects.