A 13-year-old girl and her 8-year-old brother were electrocuted Wednesday while they were swimming in the Lake of the Ozarks near Osage Beach, Missouri, authorities said. The two were swimming near a private dock in the lake when they were killed, according to a press release from the Missouri State Highway Patrol. "The children screamed when the initial shock hit and when the adults dove in (to attempt rescue) they could feel the electricity in the water," said Highway Patrol Sgt. Paul Reinsch. Then the adults turned off the electricity to the dock" before pulling the…