Gastrointestinal illness sickened more than 130 cruise ship passengers aboard a Royal Caribbean cruise earlier this month. The cause of the outbreak has not been determined.

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.

Over 140 passengers and crew members aboard a Royal Caribbean International cruise ship were sickened by a gastrointestinal illness that led to vomiting and diarrhea, according to the Centers for Disease Control and Prevention.