Published: Nov 10, 2010 6:25 PM EST
Updated: Nov 10, 2010 3:25 PM EST

LONDON (AP) - British police say a mail bomb intercepted last month at an English airport could have exploded over the East Coast of the United States.

Police said in a statement Wednesday that forensic evidence shows the device, originally sent from Yemen, could have been activated over the eastern seaboard had it not been removed from a cargo plane in the U.K.

Authorities on both sides of the Atlantic said they only narrowly thwarted the plot. They say terrorists in Yemen hid two powerful bombs inside printers and shipped them to addresses in Chicago.

One bomb was intercepted at East Midlands Airport and the other was discovered at a cargo facility in Dubai.