MILLBURN, N.J. (CBSNewYork) — Authorities were investigating Tuesday afternoon, after a woman was found dead in the South Mountain Reservation in Essex County, New Jersey.

The Essex County Prosecutor’s office said a person walking a dog found the body in the nature reserve, which is located on the cusp of Maplewood, Millburn and West Orange.

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The woman’s identity was unknown late Tuesday.

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The cause of death was also unknown.

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Prosecutors said additional information would be released as it became available.