Guardian: Diverted from his usual route along Euston Road, the driver of the Number 30 from Hackney to Marble Arch was struggling to navigate his way through the rush-hour traffic and the unfamiliar streets of Bloomsbury.
When he reached the corner of Upper Woburn Place and Tavistock Square, he decided to get help, and pulled over the double-decker to ask two Camden council parking attendants for directions.
As he beckoned them over, the bomb detonated.
"The next thing I knew there was a loud explosion and the top of the bus had been ripped off," Adesoji Adesi, one of the attendants told the Guardian.
According to eyewitnesses and police, the device appears to have been placed somewhere near the back of the bus's top deck.
See government references to the bus in the reports analysis
Times: George Psarabakis, 50, who was meant to be on another bus route but swapped with a colleague at the last minute to the No 30, thought that he had hit the pavement when the bomb went off.
Could it be more than coincidence? 'Outright terror bold and brilliant' on an advertisement on the side of the bus - large image (for another oddity see in images the Kingstar van. Kingstar specialise in quiet controlled demolition)
Sky News: Back on the buses again
Guardian: Where the bombers struck
Channel 4 news: Bus diversion video