"It was a massive explosion and the roof was about 10 metres in the air Then it floated down. There were a lot of dead people."It is believed that up to 10 people may have been killed. The police were last night still holding back details until relatives could be informed. Nor would they comment on speculation that a suicide bomber was responsible.Specialists at the BMA treated casualties after the explosion outside their headquarters.

The building was used as a mini hospital while casualties were moved away from the road and were waiting to be taken to hospital.Dr Laurence Buckman, from the BMA's GPs committee, said ambulance staff at the scene told him that about 10 people been killed in the blast. He said two died in the BMA courtyard as doctors tried to treat them."The most extreme thing I noticed as I walked in was that there was someone in bits in the road. The front of BMA house was splattered with blood and not much of the bus was left," he said.Dr Buckman said he saw the bus driver who was among the walking wounded at the scene. He appeared to be uninjured.Doctors were treating patients for shock, administering drips and stemming bleeding, working alongside ambulance and other emergency staff.By last night, the injured had been taken to specialist hospitals across London. Doctors said the victims' injuries ranged from fractures to burns to impact injuries.The police cordons remained up as forensics experts began poring over the wreckage for clues. Light rain fell intermittently on the scene.Some buses started running again, as thousands walked through a city hit by the biggest terror atrocity in its history This is London Slowly, the city started moving again. And grieving relatives of the dead remembered their lost ones aboard the No 30 from Hackney to Marble Arch.

And they wept.'There was an eerie quiet'Stephanie Riak Akuei, 44, witnessed the bus bomb at Tavistock Square: "I heard the noise of the bomb and went over to help. There were at least seven people who were obviously dead."I was joined by doctors from the British Medical Association building and later on by paramedics. We treated about nine people but I don't know if they survived. At first there was an eerie quiet."One man we extracted from the bus began screaming and screaming Another man was only visible by his head. We were trying to soothe as many as we could by saying, 'At least you are alive.'"I just keep thinking of whether the others made it."Genevieve Roberts. The moment that London's emergency planners had long dreaded came moments before 9am.