Hundreds sickened

, Posted: Wed, July 16 2014 at 3:56 PM, Updated: Wed, July 16 2014 at 4:00 PM

(KING) Hundreds of people are dealing with severe stomach discomfort after swimming in a popular park.

Horseshoe Lake Park in Port Orchard remains closed and is expected to stay that way through Friday as investigators determine what caused swimmers to get Norovirus-like symptoms.

Kitsap County health officials have tested the water and ruled out bacteria as a cause. They are leaning toward a virus being the cause.

County health officials say those showing symptoms were at the lake between Thursday and Sunday. They will be working with the CDC this week to see if they can pinpoint what caused this outbreak, but acknowledge viruses are much harder to track than bacteria.

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