Multiple Bombs Discovered in Thwarted London Plot

LONDON, June 29, 2007 — -- British and US officials are increasingly convinced that two cars found in London and laden with explosives were part of a foiled "terror plot involving Islamic extremists."

ABC News has learned that police have a clear closed-circuit television camera image of the driver of one vehicle left near Piccadilly Circus. They believe the man on the video is a known associate of jailed Islamist militant Dhiren Barot.

The two cars, both filled with "fuel, gas canisters and nails" and found near each other in central London "are clearly linked" to each other, said Peter Clarke of Scotland Yard's anti-terror command.

The first bomb, found in a silver-green Mercedes parked in Haymarket near Piccadilly Circus in the early morning hours Friday, was defused by police technicians. Later that day, police identified a suspicious blue Mercedes near Hyde Park and subsequently cordoned off Park Lane, a busy thoroughfare.

British police defused the Piccadilly Circus car bomb, made from 33 gallons of gasoline and capable of causing "significant loss of life." The bomb also included propane canisters and nails and was wired to be detonated by cell phone.

Watch World News with Charles Gibson at 6:30 p.m. EDT for the latest developments on the story.