By Raheem Salman and Yara Bayoumy BAGHDAD (Reuters) - Islamic State militants are changing tactics in the face of U.S. air strikes in northern Iraq, ditching conspicuous convoys in favor of motorcycles and planting their black flags on civilian homes, tribal sources and eyewitnesses say. They reported fewer militant checkpoints to weed out "apostates" and less cell phone use since the air strikes intensified and more U.S. allies pledged to join the campaign that began in August, saying the militants had also split up to limit casualties. ...

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