U.S. President Barack Obama's special envoy to Pakistan said Thursday that securing hard-fought gains in the Swat Valley and ensuring the safe return of refugees uprooted by the government's anti-Taliban campaign should be Islamabad's top priority. Pakistan's military is winding down an offensive that began in late April in the country's northwest and displaced some 2 million people from Swat and surrounding areas, according to the United Nations. "The highest priority right now has to be to secure the areas in Swat and Buner as the refugees return," Richard Holbrooke told reporters after a two-day visit in the Pakistani capital.