Detectives are hunting smash and grab robbers after the capital suffered its 16th big 'moped-enabled' crime in just five months. <br /><br />A gang of four suspects pulled up outside a designer second hand clothing store in leafy Knightsbridge, central London on two mopeds. <br /><br />Three suspects dressed in black and wearing in motorbike helmets tried to kick and smash their way through the shop's front door as the fourth suspect blocked the road.
