Camper deaths, presence of plague darken summer at Yosemite YOSEMITE NATIONAL PARK, Calif. — The deaths of two young campers killed when a tree branch fell on their tent and a campground closure because of plague cast a pall over California's Yosemite National Park at the height of the summer tourist season.The large limb from a black oak fell on the tent of the two young campers as they slept in the heart of the park Friday, Yosemite spokesman Scott Gediman said. The campers, described only...