Smoke rises after an explosion at the airport outside the Black Sea resort city of Burgas, Bulgaria, some 250 miles east of the capital, Sofia, on Wednesday, July 18, 2012. The blast killed 4 people and wounded at least 24 more. (AP Photo/Burgasinfo)

Photo by: STR

Smoke rises after an explosion at the airport outside the Black Sea resort city of Burgas, Bulgaria, some 250 miles east of the capital, Sofia, on Wednesday, July 18, 2012. The blast killed 4 people and wounded at least 24 more. (AP Photo/Burgasinfo)