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An unknown number of people who attended a statewide cheerleading competition at Everett’s Comcast Arena on Saturday have become ill, and state and local health officials are investigating a possible intestinal-illness outbreak.

The symptoms include vomiting and diarrhea. The Washington State Department of Health and the Snohomish Health District are investigating.

Health officials say thousands of people attended the event,  and symptoms began appearing on Sunday and Monday.   The cause and source of the illnesses, as well as the number of people sickened, are unknown. About 3,000 people attended the event, and 1,000 participated in the  competition.

Donn Moyer of the state Department of Health said at least 19 of the squads that participated in the event have reported sickness among members.

Investigators are sending a questionnaire to participants and  collecting samples for testing at the state Public Health Laboratories. People who attended the event and have severe symptoms are advised to contact their doctors.

Intestinal illnesses can be caused by several viruses and bacteria from a variety of sources. Symptoms typically include nausea, vomiting, diarrhea, and may include headaches, stomach cramps, and fever.