FILE - In this Thursday, July 19, 2012 file photo, foreign tourists wait to pass as police block the entrance of Burgas airport, Bulgaria, a day after a deadly suicide attack on a bus full of Israeli ... more 
FILE - In this Thursday, July 19, 2012 file photo, foreign tourists wait to pass as police block the entrance of Burgas airport, Bulgaria, a day after a deadly suicide attack on a bus full of Israeli vacationers. Israel's prime minister said Sunday, July 22, 2012 that his country is on alert for plots to kill more of its citizens overseas, after speculation that last week's deadly bombing of a tour bus in Bulgaria was a rehearsal for a spectacular attack on Israel's Olympics team. (AP Photo, File) BULGARIA OUT less 
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Associated Press
Sun, Jul 22, 2012 3:35 PM EDT