some interesting tenants - the CIA, the Secret Service, the Department of Defense and the Office of Emergency Management - the very office which was intended to co-ordinate a response to a disaster or terrorist attack. When we were filming we were surprised that some of the truthers seemed particularly keen to interview us on camera about the last programme we made about this third tower at 9/11. They think we have deliberately set out to conceal the truth. As one said to me "You already know the truth." The group who made the video are called "We are change". They claim we misrepresented the chronology involving one important witness who we interviewed in our last programme about 9/11. The first responder Barry Jennings was trapped inside the building for several hours along with another New York City official. They were crucial witnesses to what was going on inside Tower 7 after everyone had been evacuated shortly after the Twin Towers were hit by the two planes. As I tried to explain to them at the time, we recorded a long interview with Barry Jennings. We also carefully considered other information and came to our own view based on all of that. As the two men tried to get out of the skyscraper they were suddenly thrown into darkness. Barry Jennings said he heard explosions. We think it is likely that this was when Tower 1 collapsed, showering debris onto Tower 7. We have also recently recorded an interview with