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Guns were mostly silent and Russian air raids stopped in Syria on Saturday due to a ceasefire that took effect at midnight. Under the ceasefire, which was negotiated by the U.S. and Russia and accepted by President Bashar al-Assad's government and rebel forces, fighting should stop so humanitarian aid can reach civilians affected by a war that has lasted several years and claimed the lives of more than 250,000 people. Rebels and state-run media have already reported violations of the truce, however.