NORTH CODORUS, Pa. — A suspected stalker armed with a rifle hid inside 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 in a shootout, a prosecutor said Thursday.

Two other officers were seriously wounded before police shot the suspect to death in a hail of gunfire that capped a 15-hour ordeal after a trail camera captured an image of the suspect, armed with an AR-style rifle, peering through a scope into the house Tuesday night.

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