LAS VEGAS –  Clark County firefighters say they responded to the Rio casino in Las Vegas after 20 adults and children in town with a traveling football team came down with flu-like symptoms.

Clark County Fire Deputy Chief Erik Newman says officials were called Friday morning to help the group members, who were staying on the sixth floor of the hotel-casino.

Deputy Chief Fernandez Leary says 18 people were taken to hospitals, including 13 children between the ages of 7 and 9.

It wasn't immediately clear why the group members were sick.

The football team is from Santa Monica, Calif.