Airlines and airports have been warned of even tighter security procedures after U.S. intelligence agencies learned of potential plots against aviation targets by the al-Qaida branch in Yemen. Homeland Security says it will step up random checks for explosives at U.S. airports, and the checks won't be limited to traditional screening areas. A surge in the number of air marshals, canine patrols and behavioral experts also is expected. "We are facing a determined enemy, and we appreciate the patience of all Americans and visitors to our country, and the cooperation of our international partners as well as a committed airline industry," Homeland Security Secretary Janet Napolitano said in a statement.
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