Three police officers have been killed and two injured in a shooting in the southern part of Pennsylvania, US police say.

The shooting erupted in the area of North Codorus Township, about 185km west of Philadelphia, not far from the Maryland line, authorities said.

“The grief will be unbearable but we will bear it,” Pennsylvania State Police Commissioner Christopher Paris said at a news conference.

“We will not rest until we conduct a full, fair and competent investigation into this matter.”

York Hospital said it was treating two people in serious condition and had enhanced security protocols are in place.

“We grieve for the loss of life of three precious souls who served this county, served this commonwealth, served this country,” Governor Josh Shapiro said.

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