The chance discovery of a car bomb in London underlines the need for people to be vigilant, the mayor has said.
Mr Livingstone praised the emergency services
Ken Livingstone praised the emergency services for their professionalism in dealing with the incident.
A grey Mercedes packed with 60 litres of petrol, gas cylinders and nails, was found in the early hours in Haymarket, central London.
"All London's communities have their part to play in dealing with this threat," the mayor said.
"Once again the emergency services have served the capital well," he said in a statement.
"The Metropolitan Police Service have dealt with this with great professionalism.
"I think we would all want to thank the explosives officers for their bravery in dismantling this device, which will also yield invaluable clues."
He said the ambulance crew who originally spotted the suspect car showed "great vigilance" and deserved praise.
"The dense network of CCTV coverage now existing in central London will again be extremely important in yielding clues," he added.
The mayor called on Londoners and visitors to co-operate with the authorities so that "we can go about our business as safely as possible".
"These events show that we have to be constantly vigilant, and also that we need to respond calmly," he said.
"As the police have made clear the help of the public is going to be essential to completing this investigation."