Beach at Lake Sammamish State Park being closed after up to 15 swimmers became sick

SEATTLE -- Tibbetts Beach at Lake Sammamish State Park is being closed because up to 15 children became sick after swimming there on Friday, Public Health-Seattle & King County said Monday.

"We are in the very earliest stages of investigating this possible outbreak, and do not yet know specifically what type of organism caused the illness," the agency said.

The children became sick with vomiting and diarrhea.