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A convicted sex offender broke into a San Francisco home in the Ingleside district and raped a 9-year-old girl in her bedroom in an hourlong attack that ended when the girl's mother walked into the room, San Francisco police said.

It was 7:45 a.m. Sunday when the victim's mother heard noises and entered her daughter's room in the Silver Avenue home and found her child with the suspect, who was nude. He apparently entered an unlocked window of the home, police say.