The driver of the bus blown apart by a terrorist's bomb was left badly shaken by the attack, his wife has said.

At least two people were killed when the explosion tore through the No. 30 bus in Tavistock Square (search).

George Psaradakis' wife Alanai said: "He is OK for now, but it has not been easy for him to see these terrible things."

Another family member, who did not want to be named, added: "He did not look himself. I have never seen him like it. He was yellow."

There is speculation the blast was caused by a suicide bomber.

Police say they are keeping an open mind, but survivors have no doubts.

Richard Jones, 61, told The Sun: "I noticed him as he looked nervous. He was continually diving into his bag, rummaging round and looking in it."

Seconds after Mr. Jones stepped off the bus, it exploded with the "bomber" still on board.

Terence Mutasa, 27, a staff nurse at University College hospital (search), said: "I treated two girls in their 20s who were involved in the bus bomb. "They were saying some guy came and sat down and that he exploded."

Joely Ward, 36, was walking alongside the bus when it exploded.

She told the Daily Mirror: "There was a huge bang and a pile of glass flew over my head. As I looked down there was a mound of flesh at my feet.

"I did not even register what it was, and then I saw a hand sticking out of it. It was a torso at my feet. It was blown apart."

A student who was near the explosion and helped medics at the scene said she saw "seven people obviously dead."

Another witness, Stephanie Akuei, said: "There were at least 20 people on the bus. At least five were beyond recognition and we covered them up with blankets."