I remember Tiger Tiger in the news a year ago
http://news.bbc.co.uk/1/hi/6252276.stm"A car bomb planted in central London would have caused "carnage" if it had exploded, police say.
A controlled explosion was carried out on the car, packed with 60 litres of petrol, gas cylinders and nails, in Haymarket, near Piccadilly Circus.
An ambulance crew saw smoke coming from the green Mercedes, near the Tiger Tiger nightclub at 0130 BST (0030 GMT). London's Park Lane was later cordoned off while a suspicious vehicle was investigated.
Scotland Yard, Assistant Commissioner Tarique Ghaffur urged people to be "alert and vigilant" and to report any suspicions to the police.
Disruption would be kept to a minimum, he said, although the police were reviewing the safety of a number of big public events set to take place in the capital over the weekend.
"I want to reassure Londoners that we are doing everything possible to make them safe," he added.
Earlier, a Scotland Yard spokeswoman said that Park Lane was closed at Marble Arch to Hyde Park Corner and a 200m cordon was in place.
Sources close to the investigation said the Park Lane closure was linked to the discovery of a vehicle at an underground car park. A police robot was being used to investigate the vehicle.
"International elements" were believed to be involved with the Haymarket bomb, Whitehall sources told the BBC.
Nightclubbers
Deputy Assistant Commissioner Peter Clarke, head of Scotland Yard's counter-terrorism command, said: "It is obvious that if the device had detonated there could have been serious injury or loss of life."
The ambulance had been called to the nightclub - where up to 1,700 people were inside - when they spotted smoke, now believed to be vapour, inside the car.