2nd car had explosives, England

LONDON, England (CNN) -- As authorities were investigating an explosives-packed car discovered outside a nightclub near Piccadilly Circus on Friday, a second vehicle was found in London that had similar explosive material inside, security sources said.

Both cars were laden with large amounts of fuel, gas canisters and "a substantial quantity of nails," British police anti-terror chief Peter Clarke said.

"These vehicles are clearly linked," he said.

The second car had been parked underground near Trafalgar Square in an area where parking was not allowed.

Workers towed it to a lot on Park Lane near Buckingham Palace and thought it smelled of gasoline. Given the reports that gas canisters were among the explosive material found in the other car, they became suspicious, security sources said.

Authorities then blocked off a section of Park Lane while they examined the car and discovered the material.

Earlier Friday, a section of Fleet Street also was cordoned off briefly, then reopened without incident.