US safety agencies are investigating the crash of a small plane in Tennessee that was carrying retired race car driver Dale Earnhardt Jr and his wife and daughter. Earnhardt's sister Kelley tweeted that the two pilots of the Cessna Citation and three family members were safe and being taken to a hospital for observation. There were no serious injuries, according to officials in Tennessee cited by media. Earnhardt, who was Nascar's longtime biggest star, gave up full-time racing after the 2017 season. He now broadcasts Nascar races for NBC Sports