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MARDAN, Pakistan — Zeeshan Khan, a 17-year-old engineering student, says he knows who Pakistanis blame for what has become the largest migration in their country’s history. “These people are coming due to the bombing,” he said, gesturing to the thousands of refugees milling around the Mardan refugee camp. “Due to the jet artillery, the F-16s, the heavy weapons. All our houses are destroyed.” More than 900,000 people have left their homes in and around Swat valley in the last few weeks, adding to a total of 1.4 million people displaced so far by fighting between the Pakistani Army and militants. […]