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A picture shows smoke rising over Bourgas airport on July 18, 2012. Three people were killed and more than 20 wounded in an apparent bomb attack on a bus packed with Israeli passengers at a Bulgarian airport, officials said, with media saying the toll would rise.  AFP PHOTO / BGNES / BOURGAS INFOSTR/AFP/GettyImages
A picture shows smoke rising over Bourgas airport on July 18, 2012. Three people were killed and more than 20 wounded in an apparent bomb attack on a bus packed with Israeli passengers at a Bulgarian airport, officials said, with media saying the toll would rise.  AFP PHOTO / BGNES / BOURGAS INFOSTR/AFP/GettyImages

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    Bulgaria bus blast a suicide attack?

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Bulgaria bus blast a suicide attack?

Authorities say the Bulgaria bus blast was likely caused by a suicide bomber. CNN's Atika Shubert reports.

Bulgaria bus blast a suicide attack?

Authorities say the Bulgaria bus blast was likely caused by a suicide bomber. CNN's Atika Shubert reports.