Jerusalem (AsiaNews / Agencies) - The bomber who blew himself up on a bus of Israeli tourists (pictured) at Burgas airport, Bulgaria, had a false U.S. passport. The explosion caused seven deaths, six of which Israelis and 34 wounded, some of them severe.

The Bulgarian Prime Minister, Boyko Borisov, said the attack was due to a suicide bomber and not, as it was thought at first, a bomb placed in the trunk of the bus. "The odious attack on the soil of a sovereign state, a member of the European Union - he added - is a challenge that indicates the sabotage of efforts to promote peace."

The bomber, a Caucasian man, with long hair and in sportswear, is shown by the surveillance cameras wandering around for an hour near the airport.

Two air force C-130 Hercules have been chartered to arrive and bring the Israeli who have suffered the attack back at home.

The attack was also condemned by the U.S. President, Barack Obama, who in a telephone call to Israeli Prime Minister Benyamin Netanyahu, offered U.S. aid in investigations. For his part Netanyahu has already indicated  who is responsible. "All signs lead to Iran. In recent months - he added - we have seen Iranian attempts to attack Israelis in Thailand, India, Georgia, Kenya, Cyprus and other places."