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GREAT FALLS, Mont. (AP) An 18-year-old man is missing and feared drowned in the Bonneau Reservoir on the Rocky Boy's Indian Reservation in north-central Montana.

Members of Chouteau County Search and Rescue scoured the reservoir Monday for the teen. An aunt and nephew say the victim was swimming Saturday afternoon when he disappeared.

Authorities say they presume the teenager drowned.

No other information about the victim has been released.

Information from: KFBB-TV, http://www.kfbb.com Great Falls Tribune, http://www.greatfallstribune.com (Copyright 2009 by The Associated Press. All Rights Reserved.) APNP 09-21-09 2319CDT | save this article / add to your favorites list