A suicide attack at a Bulgarian airport which killed six people, five of them Israeli, was carried out by Lebanon's Hezbollah in conjunction with Iran, Prime Minister Benjamin Netanyahu said today.

"Yesterday's attack in Bulgaria was perpetrated by Hezbollah, Iran's leading terrorist proxy," he told a news conference in Jerusalem, describing the Lebanese militia as "the long arm of Iran."

The attack was part of "a global campaign of terror carried out by Iran and Hezbollah" which had reached "a dozen countries on five continents," he said.

The international community must make it clear that Iran was the country behind this attack and must do everything possible to prevent Tehran from obtaining nuclear weapons, Netanyahu said.

"Everything should be done to prevent Iran, the world's most dangerous regime, from developing the world's most dangerous weapons," he said.

Israel would continue to fight against terror, he said, pledging that the Jewish state would "exact a heavy price from those who support it."

Israeli President Shimon Peres in a separate address also blamed Lebanon's Hezbollah and Iran for the carnage.