A 14-year-old boy and a 29-year-old woman, both from Yakima, drowned Saturday at Rimrock Lake, according to authorities.

Witnesses said the woman swam into the lake to retrieve a flotation device when the boy offered to help her, according to a news release issued by the Yakima County Sheriff’s Office.

The boy began to panic in the water, and apparently struggled with the woman and pulled her under the water. Both became exhausted and were unable to make it to shore, the release said.

At least two bystanders entered the water and pulled the woman to shore, but were unable to find the boy, the release said.

Others preformed CPR on the woman, but attempts to revive her were unsuccessful, the release said. Paramedics summoned to the area about 11:45 a.m. also were unable to revive her, the release said.

About two hours later, a sheriff’s office water rescue team using a boat found the boy roughly 25 feet from shore in about 10 feet of water, the release said.

The incident occurred near a peninsula on the southern side of the lake, the release said.

The boy and woman were not related and it did not appear that they had been acquainted before the incident. It also was reported that both were able to swim, the release said.

The Yakima County Coroner’s Office reported that the families of both victims had been notified Saturday night, but their names were not immediately available.