The U.S. Department of Labor has found that more than 300 children, including two 10-year-olds, were working in violation of federal labor laws at 62 McDonald's restaurants across four states. The 10-year-olds were found to be working until as late as 2 a.m. and performing prohibited tasks such as operating a deep fryer. The Department of Labor is currently investigating the violations and has not yet announced any penalties.