An electromagnetic pulse (EMP) attack is one of the "huge" potential threats that the Federal Bureau of Investigation (FBI) worries about. At least that is what Art Cummings, a deputy assistant director in the agency's Counterterrorism Division, told Ronald Kessler in an interview for Kessler's new book The Secrets of the FBI.
An EMP is a high-intensity burst of electromagnetic energy caused by the rapid acceleration of charged particles. The burst causes disruption of an electromagnetic system and fries electronic devices within its line of sight. Depending on its intensity, an EMP could instantly send the United States back to the 19th century. An EMP is one of the results of a nuclear weapon explosion, but non-nuclear weapons and geomagnetic storms can cause it as well. Despite the FBI's recognition, the United States remains largely unprotected from the effects of an EMP.
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