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Three police officers were killed and two others were injured in York County after encountering a man who was suspected of stalking a former girlfriend.

By Sonia A. RaoJacey Fortin and Nicholas Bogel-Burroughs

Sonia A. Rao reported from York County, Pa. Jacey Fortin and Nicholas Bogel-Burroughs reported from New York.

An investigation that brought police officers to a quiet country road in Pennsylvania on Wednesday originated with a phone call about a man who appeared to be stalking a former girlfriend.