Smoke rises over Bulgaria's Burgas Airport after an explosion on a bus carrying Israeli tourists

BURGAS, Bulgaria - A deadly explosion on a bus carrying Israeli tourists outside an airport in Bulgaria was "clearly a terrorist attack," Israeli Defense Minister Ehud Barak said Wednesday.
Key Israeli politicians pointed to Iran as the likely instigator, but Israel's U.S. ambassador acknowledged they had no proof.

• Vania Valkova, director of the Bulgarian Interior Ministry press office, said that at least seven people were killed and about 30 wounded in the explosion in a parking lot outside Burgas Airport, on the Black Sea. The Foreign Ministry said six died and 32 people were wounded, with three in intensive care.
• The attack was probably initiated by a group under the auspices of "either Iran or other radical Muslim groups," according to Barak, who cited Hezbollah and Hamas as likely suspects.

Bulgaria's foreign minister, Nikolay Mladenov, told CNN he presumes the explosion was a terrorist attack. But he said it was not time to "starting assigning blame."
Bulgaria will ask the U.N. Security Council to condemn the attack, perhaps Thursday, said Mladenov, who traveled to the blast scene.
The bus was scheduled to carry about 47 passengers to a resort. Bulgaria is a popular destination for Israelis.