YORK, Pa. — On Wednesday afternoon, three police officers were killed, and two others were injured in a shooting in North Codorus Township, York County.

State Police told CNN that the officers were at the scene following up on a domestic investigation that began Tuesday. The shooter was shot by police and was killed, Pennsylvania State Police Commissioner Col. Christopher Paris said.

What we know about the shooter:

Authorities have not identified the shooter at this time, but more information has been gathered about what led up to the incident.

According to CNN, the shooter is allegedly the ex-boyfriend of a woman who lived in the farmhouse on Haar Road where Wednesday's incident occurred.

On Tuesday, Sept. 16, the woman reportedly observed the shooter stalking the house in a cornfiel

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