WILLIAMSPORT, Pa. (AP/KDKA) – A Pennsylvania hospital network says it has treated 51 people for heroin overdoses in the last 48 hours.

UPMC Susquehanna is warning the surrounding communities of a possibly lethal batch of the drug in the region.

The hospital system posted on its Facebook page that emergency rooms and other facilities dealt with an unusually high number of overdoses Thursday. The original post from Thursday afternoon said they had treated 36 people for heroin overdoses in 24 hours.

Late Friday morning, they updated the number to 51 patients with heroin overdoses in 48 hours.

UPMC Susquehanna operates hospitals in the central part of the state, anchored by the 203-bed Williamsport Regional Medical Center.

The hospital system is urging people who think they might have used the drug or are experiencing overdose symptoms to go to the emergency room immediately or call 911.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)