PORTLAND, Ore. (KOIN) — A person was rushed to a hospital in serious condition on Tuesday evening after being found face down in the river at Clackamas Cove in Oregon City, authorities said.

Bystanders pulled the unconscious person out of the water and started CPR before firefighters arrived at about 6:45 p.m. First responders started advanced life support and the person was transported by a Clackamas County Sheriff’s Office boat to Clackamette Park.

From the park, the person was taken by ambulance to a local hospital.

He was in serious condition at that time. It’s unclear why he lost consciousness in the water.