Amateur video, which cannot be independently verified by Reuters, appears to show Syrian rebels storming a battle-scarred government building in northwestern Idlib province.<br/> <br />The video comes amid reports that an al Qaeda splinter group finished pulling out of two provinces in the country's northwest Friday.<br/> <br />The Islamic State in Iraq and the Levant, a former al Qaeda affiliate, and competing insurgents have been fighting since the start of the year.<br/> <br />Rights groups say some 4,000 people have been killed in rebel infighting, undermining the revolt against President Bashar al-Assad.<br/> <br />As the conflict in Syria enters its fourth year, demonstrations in a suburb of Damascus.<br/> <br />The conflict has killed more than 140,000 people and forced millions to flee their homes.