Yosemite National Park (United States) (AFP) – Hundreds of firefighters scrambled Monday to prevent a wildfire engulfing an area of rare giant sequoia trees in California’s Yosemite National Park. The Washburn fire, in the world-renowned Mariposa Grove of giant sequoias, was first reported on July 7 and doubled in size over the weekend to 2,340 acres (946 hectares), according to a park report. Yosemite’s fire management service said 545 firefighters were battling the fire, including “proactively protecting” the grove — the largest group of sequoias in Yosemite, with over 500 mature trees. The…