SINJAR, Iraq — Supported by U.S.-led airstrikes, Kurdish Iraqi troops seized part of a highway that is used as a vital supply line for Islamic State on Thursday, a key initial step in a major offensive to retake the strategic town of Sinjar from the militants. The town was overrun by the extremists as they rampaged across Iraq in August 2014, leading to the killing, enslavement and flight of thousands of people...
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