DANNEMORA, NY. (THECOUNT) — An unknown number of Clinton Correctional Facility staff members were transported to area hospitals after an unknown substance was found inside of a letter Friday morning.

The incident prompted several local and state authorities to respond in an active hazmat situation at the Clinton Correctional Annex on Friday.

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Department of Corrections and Community Supervision officials say an unknown substance was found inside of a letter Friday morning, causing “a number” of staff to feel ill and be taken to an outside hospital, reports MyNBC5.

A local hazmat team, New York State Police and the DOCCS Office of Special Investigations are on the scene.

The facility is located at, 1156 Cook St in Dannemora, NY.

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Geo quick facts: Dannemora is a town in Clinton County, New York, United States. The population was 4,898 at the 2010 census. The town is named after Dannemora, Sweden, an important iron-mining region. The town of Dannemora contains a village also called Dannemora, the south part of which is located in the town of Saranac – Wikipedia.