“An explosive device found in a cargo plane in England last month probably would have exploded over the Eastern Seaboard of the United States if it had not been discovered, Scotland Yard said Wednesday.
The device was primed to explode about six hours after it was found, a senior U.S. counterterrorism source told CNN.”
(Source: Scotland Yard: Cartridge bomb might have exploded over Eastern U.S. – CNN.com.)