NORTH CODORUS TOWNSHIP, Pa. -- At least one officer is believed to be dead and several have been shot Wednesday while they were serving a warrant in York County, Pennsylvania , law enforcement officials briefed on the investigation confirmed to ABC News.

An investigation is occurring in the area of North Codorus Township, about 115 miles west of Philadelphia , not far from the Maryland line, authorities said.

York Hospital said it was treating two people in serious condition related to a police incident in northern York County. The hospital said enhanced security protocols are in place.

"Please send prayers to the officers and those involved in the shooting in York County," Pennsylvania Lt. Gov. Austin Davis said in a social media post.

A local school district issued a shelter-i

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