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Security Technology

How Police Trace Cellphones in IEDs Like the Ones in NYC

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A CELLPHONE MAKES a convenient detonator for an improvised explosive device. But it’s also one of the most conveniently trackable devices under the eye of American law enforcement.

Less than 48 hours after a bomb exploded in a dumpster on a streetcorner in the Chelsea neighborhood of New York—and another device a few blocks away failed to explode—police have tracked the attack to New Jersey resident Ahmad Khan Rahami. At least one crucial link that investigators seem to have made came from the cellphone planted in one of the bombs. The incident is a reminder of just how difficult it is to anonymously use a cellphone in America—whether to sell drugs, make an untraceable call to a journalist, or explode a deadly weapon in downtown Manhattan.

“Buying a burner phone correctly isn’t easy,” says Nicholas Weaver, a security- and privacy-focused computer science researcher at Berkeley University, referring to the pre-paid phones often used by criminals and terrorists. “Using a burner phone correctly isn’t easy.” For the operator of a remote explosive device, he adds, that means “a cellphone-type detonator is a good robust mechanism….As long as you don’t mind a high probability of getting caught.” – READ MORE

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