In a news conference Deputy Assistant Commissioner Peter Clarke said the second car, a blue Mercedes, was parked a few hundred yards from the first in Cockspur Street which runs between Haymarket and Trafalgar Square. It was issued with a parking ticket at around 2:30am before being towed to the Park Lane car pound where staff alerted police. DAC Clarke said: "The vehicle was found to contain very similar materials to the first vehicle in Haymarket.
"There was a considerable amount of fuel, gas cannisters and a quantity of nails. This device, like the first was viable and was made safe by officers.The discovery of a second bomb is obviously troubling and reinforces the need for the public to remain vigilant."
He also asked anyone who may have seen the blue Mercedes parked in Cockspur Street to come forward. (Sky News)