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.
"We are not aware of indications of any specific or imminent terrorist-attack plotting against the oil and natural gas sector overseas or in the United States," said Homeland Security spokesman Matthew Chandler.
"However, in 2010 there was continuing interest by members of al Qaeda in targeting oil tankers and commercial oil infrastructure at sea."
Chandler said it is "unclear if any further planning has been conducted" since the middle of last year.