FILE - In this Thursday, July 19, 2012 file photo a damaged bus is transported out of Burgas airport, Bulgaria, a day after a deadly suicide attack on a bus full of Israeli vacationers. U.S. officials expect Bulgarian investigators to link the militant group Hezbollah to the July 18 attack in the coastal city of Burgas, in which a bomb ripped through a bus that was taking the tourists to their hotel. Bulgarian authorities are expected to release their findings on Tuesday Feb. 5, 2013. (AP Photo/ Impact Press Group, File)

Associated Press
FILE - In this Thursday, July 19, 2012 file photo a damaged bus is transported out of Burgas airport, Bulgaria, a day after a deadly suicide attack on a bus full of Israeli vacationers. U.S. officials expect Bulgarian investigators to link the militant group Hezbollah to the July 18 attack in the coastal city of Burgas, in which a bomb ripped through a bus that was taking the tourists to their hotel. Bulgarian authorities are expected to release their findings on Tuesday Feb. 5, 2013.  (AP Photo/ Impact Press Group, File)
FILE - In this Thursday, July 19, 2012 file photo a damaged bus is transported out of Burgas airport, Bulgaria, a day after a deadly suicide attack on a bus full of Israeli vacationers. U.S. officials expect Bulgarian investigators to link the militant group Hezbollah to the July 18 attack in the coastal city of Burgas, in which a bomb ripped through a bus that was taking the tourists to their hotel. Bulgarian authorities are expected to release their findings on Tuesday Feb. 5, 2013. (AP Photo/ Impact Press Group, File)
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