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PORTLAND, Ore. (AP) — A woman who escaped her kidnapper by punching her way out of a homemade cinder block cell at a home in southern Oregon likely saved other women from a similar fate, authorities said, by alerting them to a man they now suspect in sexual assaults in at least four more states.

Negasi Zuberi posed as an undercover police officer when he kidnapped the woman in Seattle, drove hundreds of miles to his home in Klamath Falls and locked her in the garage cell until she bloodied her hands breaking the door to escape, the FBI said Wednesday.

edit: spelling correction