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.

They opened the door and were immediately fired upon by the suspect, who was carrying an AR-15 rifle with a suppressor, York County District Attorney Tim Barker said.

He said the suspect fired multiple rounds at the four officers at the door, killing three of them.

All three slain officers and a fourth who remains hospitalized worked for the Norther

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