Catrin Nye, BBC Asian Network, Young Muslims step in police's shoes, 2 Nov 09 "On the fifth floor of Scotland Yard in central London, live video feeds are coming in with news of a terror threat.
"The 30 people in the room are forced to make decisions that could change lives - which homes do they raid? Who do they stop and search?
"But they are not counter-terror officers, in fact many of them are not even sure they trust the police.
"They are 17 to 25-year-olds from around London, nearly all of them Muslim, and they are acting as if they are officers responding to a terror attack as part of Act Now, an exercise run as part of the government's £140m Prevent programme."
More on Prevent from the Home Office site