Officials worry about solitary terrorists

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WASHINGTON, Aug. 18 (UPI) -- A so-called lone-wolf terrorist may be the greatest threat within the United States, officials say.

The FBI and Department of Homeland Security, in a bulletin Tuesday, reminded law enforcement agencies of Anders Behring Breivik, charged with 78 deaths in Norway, CNN reported. Breivik allegedly killed eight people in a bombing in downtown Oslo before gunning down 69 people, many of them children and teenagers, at a political summer camp.

Breivik "is believed to have acted alone and used legal methods to procure the vast majority of materials and weapons needed for his operation, successfully avoiding law enforcement suspicion," the bulletin said. The federal agencies said the solitary terrorist is often harder to detect than a group.

President Barack Obama, in an interview this week with CNN, said a lone terrorist is "the most likely scenario we have to guard against now."

Fort Hood, Texas, has been the target of two alleged lone wolf attacks. An AWOL soldier, Naser Abdo, was arrested near the base in July after a sales clerk in a gun store reported to police he had been behaving suspiciously. Maj. Nidal Hasan, an Army psychiatrist who was stationed at Fort Hood, is awaiting trial on charges of killing 13 people and wounding many others in November 2009.