LYNDEN, Wash. (AP) _ Health officials say at least three schoolchildren have become sick with E. coli after attending a Whatcom County dairy festival last week.

KGMI Radio in Bellingham reports ( ) that more than 1,000 elementary school pupils attended the Milk Makers Fest at the Lynden fairgrounds.

Greg Stern with the Whatcom County Health Department says three children came down with bloody diarrhea and there are three more suspected cases of E. coli. The cluster indicates the illnesses are associated with the festival, although a specific source hasn’t been identified yet.

The festival was sponsored by the Whatcom County Dairy Women. It featured farm animals, including cows, horses, sheep, rabbits, chickens and a calf.