KABUL – International troops and Afghan police seized 250 tons of ammonium nitrate fertilizer — enough to make up to a couple hundred roadside bombs, the Taliban's most lethal weapon in what has been the deadliest year of the war, NATO announced Tuesday. Separately, video footage emerged of insurgents brandishing what appears to be limited stocks of U.S. ammunition in a remote area of eastern Afghanistan where eight Americans died in a battle last month. NATO officials hoped Sunday's raid in the southern city of Kandahar would hurt Taliban militants, whose homemade bombs have become the biggest killer of U.S....