A suicide bomber was behind the blast against Israeli tourists in Bulgaria, officials confirmed, according to AFP.

Israeli Prime Minister Benjamin Netanyahu has blamed arch foe Iran for the attack. The explosion ripped through a bus picking up tourists arriving from Tel Aviv at the airport of Burgas to head for the beaches and seaside resorts of the formerly communist European Union country.

"The explosion was caused by a man who died in the attack and whose identity has not yet been established," Bulgarian Interior Minister Tsvetan Tsvetanov said.

The bomber, who was also killed in the blast, was carrying a fake driving license from the US state of Michigan, he added.

The blast killed six Israelis, one Bulgarian and the bomber, Tsvetanov said. The previous toll stood at six killed and more than 30 injured.