(Reuters) – About four days after a wildfire started in Yosemite National Park, firefighters in California have begun to contain the blaze, which has threatened some of the oldest giant sequoia trees in the world, officials said on Monday. None of the park’s landmark giant sequoias, the world’s largest tree species by mass, have been reported destroyed by the fire, officials said. “We are starting to see some containment,” Matt Ahearn, operations section chief with California Interagency Incident Management Team 13, said in a video briefing. A press statement published after Ahearn’s briefing …