Human rights activists breached royal security and jumped a fence into the main arena as Bahrain's Prince Nasser presented the Kings Cup at the Royal Windsor Horse Show this afternoon. <br /><br />Activists opposed to the Bahrain regime were wrestled and dragged away by security. <br /><br />It is understood that two people were arrested.<br /><br />Queen Elizabeth II was pictured at the horse show at Windsor Castle in Berkshire.<br /><br />It takes place from May 9-13 and includes international jumping and dressage events, among others.<br /><br />The apparent security breach occurred just days before the queen's grandson Prince Harry and American Meghan Markle tie the knot at Windsor Castle next Saturday (May 19).