BBC News report from the morning of July 7th 2005, the day of the London bombings. Talks of an explosion in Russell Square, possibly in a litter bin, possibly blowing the top off a bus. Says Scotland Yard have confirmed an explosion in Russell Square. Eyewitness Jim Millington describes explosion on a bus in Tavistock Square. Also says Scotland Yard and trade union officials talking about three explosions on buses in Central London.