Royal Caribbean's Navigator of the Seas was on a week-long, round-trip cruise when passengers became sick, the CDC said.

The U.S. Centers for Disease Control and Prevention has announced that an unknown illness sickened several people aboard a cruise ship earlier this month.

(WJW) — A gastrointestinal outbreak aboard a Royal Caribbean cruise ship sickened more than 130 people. It happened earlier this month, according to the Centers for Disease Control and Prevention (CDC), on a round-trip from Los Angeles to Mexico.