London Lord Mayor Ken Livingstone described today’s terrorist attacks as an "indiscriminate attempt at mass murder".
But Mr Livingstone, speaking in Singapore, warned the terrorists: "Whatever you do, however many you kill - you will fail."
The attack happened a day after London was named as the host for the 2012 Olympic Games and brought an abrupt end to celebrations. Official celebrations to mark London's Olympic win have now been put on hold, London 2012 confirmed.
As the delegation prepared to board a flight home from Singapore, Mr Livingstone said: "This was not a terrorist attack against the mighty and the powerful. It was not aimed at presidents or prime ministers. It was aimed at ordinary working-class Londoners, black and white, Muslim and Christian, Hindu and Jew, young and old.
"Indiscriminate slaughter irrespective of any consideration for age, class, religion, whatever. That isn't an ideology. It isn't even a perverted faith. It is just an indiscriminate attempt at mass murder," he said.