Robbers carrying a firearm stole a motorcycle from a man in the early hours of Sunday.Two men on a motorcycle accosted the victim, a 20-year-old Southampton man, as he rode the vehicle in Middle Road, Southampton, at about 2am.Police say one of the offenders brandished the weapon before they grabbed his motorcycle and rode off. The victim was not injured.The main suspect is described as a brown skinned male, about 5ft 10in, wearing a black helmet with a dark coloured visor, a dark coloured jacket and black shoes. His accomplice is described as a light skinned male, wearing a black helmet with a dark coloured visor and a red shirt. The stolen motorcycle is a white Aprilia SportCity 125 bearing license plate BX 665.Anyone with information on the incident or the whereabouts of the stolen motorcycle should call Somerset Criminal Investigation Unit on 234-1010.