The Department of Homeland Security and the FBI have warned police across the United States that al Qaeda has a "continuing interest" in attacking oil and natural gas targets, a department spokesman said Friday. The warning came as a result of information seized during the May 2 raid that killed Osama bin Laden in Pakistan, a U.S. official said.
Investigators are poring over the items for intelligence. Not long after the raid, investigators said materials taken from bin Laden's compound revealed details about a possible attack on the 10th anniversary of 9/11.
The material suggests that al Qaeda was particularly interested in striking Washington, New York, Los Angeles and Chicago, according to a law enforcement official who spoke on condition of anonymity.
U.S. authorities have found that al Qaeda appeared especially interested in striking on significant dates such as July Fourth, Christmas and the opening day of the United Nations.
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