At least 7 dead in North Texas after severe storms

A series of powerful storms swept over the central and southern U.S. over the Memorial Day holiday weekend, killing at least 21 people and leaving a wide trail of destroyed homes, businesses and power outages.In North Texas, seven people died in Cooke County from a Saturday tornado that tore through a mobile home park, officials said. Two people also died in Mayes County, Oklahoma, east of Tulsa, authorities said. More deaths were reported in Arkansas and Kentucky.More than 600,000 customers across the eastern U.S. were without power Monday morning, including more than 170,000 in Kentucky. Twelve states reported at least 10,000 outages, according to PowerOutage.us.The area on highest alert for severe weather Monday is a broad swath of the eastern U.S., from Alabama to New York.The destructive storms began Saturday night and included a tornado that overturned heavy recreational vehicles and shut down an interstate near Dallas. Officials said multiple people were transported to hospitals by ambulance and helicopter in the Texas county of Denton but did not immediately know the full extent of injuries.Forecasters had issued tornado and severe thunderstorm warnings for parts of Texas and Oklahoma, as some heat records were broken during the day in South Texas...