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Syrian rebels launched a fierce attack Wednesday on an intelligence headquarters in Aleppo, leaving at least 34 dead, days after the opposition rejected a UN ceasefire plan for the city. At least 20 members of regime security forces and 14 rebels were killed in a powerful blast and attack targeting air force intelligence offices in the west of Aleppo, the Syrian Observatory for Human Rights. The attack began with a huge blast from explosives in a tunnel near the intelligence building, the Observatory and a Syrian military source said. "Gunmen blew up a tunnel that they dug (into the regime-controlled sector) and then attacked the area surrounding the air force intelligence headquarters," the military source said.