enormous pink balloons that were part of the stagecraft. it was only moments later the people began to realize that wasn't it at all. some left to other exits and probably never saw any of this but those who went out the main exit, the one that led down into the tube station -- or off to the trams at the right or the pickup area, all of them sought. some of the witnesses with whom we have spoken tonight, as they were running down the escalators and trying to make their way out of the building, they noticed as they described it carnage in front of the building. police now describe seeing the remains of the bomb and the remains of a human. whom they believe the device was trapped. it is the u.s. authority to tell reporters that they believe this was a suicide bomber. when all the exiting was happening.