The Last Line of Protection for the Queen

The line to view the queen lying in state got so long it was temporarily shut down. The river of people lining up to pay their respects has become a flood. 20 thousand police deployed, including armed anti terror squads. Parts of london have already become a fortress with visible signs of security everywhere. But it's also what you don't see: uniform police officers and uniform roads. And surveillance officers, intelligence officers, all building the picture of what is happening within that crowd.