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By Jeffrey Heller and Sylvia Westall JERUSALEM/BEIRUT (Reuters) - The threat of a full-blown conflict between Israel and Hezbollah increased on Wednesday after the Lebanese militant group fired a missile at an Israeli army vehicle along the frontier and wounded seven soldiers, the biggest escalation since a 2006 war. The attack, which Hezbollah said was carried out by one of its brigades in the area, was in apparent retaliation for a Jan. 18 Israeli air strike in southern Syria that killed several Hezbollah members as well as an Iranian general. It came hours after air strikes by Israeli jets near the occupied Golan Heights overnight, which Israel's military said was in response to rocket fire from Syria. Tensions in the region, where the frontiers of Israel, Lebanon and Syria meet and militant groups opposed to Syrian President Bashar al-Assad are active, have been bubbling for months but have boiled over in the past 10 days.