As many as 80 children and parents have reportedly fallen ill with nausea, diarrhea and vomiting after attending a youth football tournament in Las Vegas last week, according to NBC affiliate News 3. As of Sunday afternoon, the exact cause of illness was still unclear, but at least 13 children and five adults have been treated at hospitals for foodborne illness. All of those who became ill were staying at the Rio All-Suite Hotel & Casino. It is unclear if anyone staying at other hotels was treated at hospitals. Food Safety News will update this story as more information becomes available.