Iran and Syria bear responsibility for spiraling Middle East violence because they support Hizbullah in its fight against Israel, British Prime Minister Tony Blair said Tuesday. Blair, who was briefing lawmakers following the Group of Eight summit in Russia, said it was clear that Hizbullah - and not Israel - was to blame for the onset of fighting that has killed more than 250 people in a week. "Hizbullah is supported by Iran and Syria. By the former in weapons, .... by the latter in many different ways - and by both of them financially," Blair said. Blair said that while some critics had urged the G-8 leaders to call for an immediate cease-fire by Israel, they ultimately decided there could be no point in pressuring Israel until operatives in Lebanon stopped rocket attacks on Israel and freed captive Israeli soldiers.