Homeland security

A secret group bought the ingredients for a dirty bomb — here in the U.S.

The clandestine group’s goal was clear: Obtain the building blocks of a radioactive “dirty bomb” — capable of poisoning a major city for a year or more — by openly purchasing the raw ingredients from authorized sellers inside the United States.

It should have been hard. The purchase of lethal radioactive materials — even modestly dangerous ones — requires a license from the Nuclear Regulatory Commission, a measure meant to keep them away from terrorists. Applicants must demonstrate they have a legitimate need and understand the NRC’s safety standards, and pass an on-site inspection of their equipment and storage.

But this secret group of fewer than 10 people — formed in April 2014 in North Dakota, Texas and Michigan — discovered that getting a license and then ordering enough materials to make a dirty bomb was strikingly simple in one of their three tries. Sellers were preparing shipments that together were enough to poison a city center when the operation was shut down.