The wildfire in Colorado, the United States, has spread rapidly under strong winds, burning more than 600 hectares of land and more than 500 houses, and at least six people are injured.Tens of thousands of people have been forced to evacuate in tens of thousands of people near Denver, the largest city of Denver, Kizhou.Experts analyzed that "historic" gusts plus less than 20%relative humidity, and continuous drought are the reason why the fire spread rapidly.(Reuters)