Marquez dislocates shoulder in MotoGP warm-up

(Reuters) - World championship leader Marc Marquez dislocated his left shoulder in the warm-up session before the British MotoGP at Silverstone on Sunday, the MotoGP website (www.motogp.com) reported. The Spaniard, who has won the last four races, crashed in cool conditions and was taken to the track's medical centre. It was not clear whether Marquez, who leads the world championship standings by 26 points, would be able to take his place at the front of the grid.