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One 10-year-old boy was killed and his 6-year-old brother is missing, presumed dead, at Yosemite National Park, after the two were swept away by a river on Thursday. The two children, visiting with their family from Southern California, were resting with their hiking group at the side of the river when the current carried them away. The older boy was pulled out 150 yards downstream, but couldn't be resuscitated. The site, the Vernal Fall Footbridge, leads to a large waterfall, where three Californian tourists were killed last year.