NORTH CODORUS, Pa. (AP) — A suspected stalker armed with a rifle hid at his ex-girlfriend's home in the rolling farmland of southern Pennsylvania and ambushed police officers who came to arrest him, killing three of them, a prosecutor said Thursday

Police arriving at the scene at about 2:10 p.m. Wednesday noticed the door to the home was unlocked even though the ex-girlfriend and her mother had locked it before leaving the property earlier.

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