WASHINGTON (AP) — Prosecutors in Washington say a man has been sentenced to 20 years in prison for sexually assaulting his 15-year-old daughter and her 15-year-old friend.

The man was also ordered to register as a sex offender at sentencing Friday.

According to government evidence, the man repeatedly sexually assaulted his daughter in 2010 while she was living with him and his girlfriend. Prosecutors say the man also sexually assaulted his daughter’s friend.

The Associated Press, which does not identify victims of sexual assault, is not naming the man.

(© Copyright 2012 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)