A teenager who has been missing since Thursday afternoon after being swept up by the rushing Russian River in Sonoma County has been found dead.

KTVU had the news that a swimmer disappeared in the Russian River after being swept away by strong currents Thursday afternoon. An early KPIX report suggested that the swimmer was “possibly only 10 years old,” but the Press Democrat has since confirmed that the missing boy was 15 years old.

As of Friday afternoon, we have word that the boy's body was recovered underwater in the river. The recovery happened around 10:30 am with the help of a remote-operated search device.

The teen was last seen swimming with another boy at 4:40 pm Thursday afternoon, and initially both youths disappeared in the current. The Sonoma County Fire District was called to the scene and quickly rescued one of them, an unnamed 14-year-old who was reportedly able to get out of the water on his own.

But the other swimmer was not located. The search was turned over to the Sonoma County Sheriff's Department, who employed boats, jet skis, divers, and drones. That search was suspended at about 9 pm Thursday night when darkness fell, but the efforts resumed early Friday morning.

The radio station KSRO reports the two boys were originally swept away at an area called at Steelhead Beach, north of Forestville in Sonoma County.

"We caution people this time of year to really watch the water,” Sonoma County battalion chief Shawn Johnson told KTVU. “The water is moving fast. It is still at a high level. If you are not an experienced swimmer, you should not swim in the Russian River at this time."

As the Press Democrat notes, Steelhead Beach remains closed indefinitely. Safety patrols on the river do not start until Memorial Day weekend.

Related: Sonoma Sheriff's Deputies Save Woman Drowning in Russian River, She Assaults Them Anyway [SFist]

Image: @sonomasheriff via Twitter

This story has been updated throughout.