Forces gear up to protect Olympics Elite police and military teams joined forces on Thursday to showcase Britain's biggest peacetime security operation. Scotland Yard and the Royal Marines took to the river Thames in a show of strength against terrorists intending to target the Olympics. Around 50 marine police officers in rigid inflatables and fast response boats were joined by up to 100 military personnel and a Lynx Navy helicopter for the familiarisation exercises. The string of high-speed drills come amid fears attackers could use the waterways to launch onslaughts on the capital's landmarks. Assistant Commissioner Chris Allison, head of the force's security operation, said a Mumbai-style terror attack was one of a host of potential threats to the Games. Speaking on the shores of the Thames, he said: "There is no specific threat from the river but we would be failing in our duty to ignore it at games time. What you have seen today is the sort of things we can do. Typhoon jets and HMS Ocean, the largest ship in the Royal Navy's fleet, will eventually be deployed to protect the Games along with up to 13,500 military personnel.