A wildfire burns near Los Alamos, N.M., on Tuesday, June 28, 2011. Thousands of residents calmly fled from the town that's home to the Los Alamos nuclear laboratory, ahead of an approaching wildfire that sent up towering plumes of smoke, rained down ash and sparked a spot fire on lab property where scientists 50 years ago conducted underground tests of radioactive explosives. (AP Photo/Jae C. Hong)
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