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A picture shows destroyed buses after a bomb explosion at Bourgas airport on July 18, 2012. Three people were killed and more than 20 wounded on Wednesday 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 / BULFOTOSTR/AFP/GettyImages
A picture shows destroyed buses after a bomb explosion at Bourgas airport on July 18, 2012. Three people were killed and more than 20 wounded on Wednesday 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 / BULFOTOSTR/AFP/GettyImages

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'We presume this is a terrorist attack'

Nikolay Mladenov, Bulgarian Foreign Minister, talked to CNN's Becky Anderson about the bus attack in Bulgaria.

'We presume this is a terrorist attack'

Nikolay Mladenov, Bulgarian Foreign Minister, talked to CNN's Becky Anderson about the bus attack in Bulgaria.