A person walking through a Manhattan park found a severed horse head in a cardboard box, and authorities are still trying to determine where it came from.

Around 11 a.m. on Sunday at Harlem River Park, a woman walking near 190th Street found a cardboard box containing the gruesome contents, CBS reported.

Police said in a related NBC article that the box contained the severed horse head as well as other animal parts.

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The Department of Sanitation arrived on the scene and removed the box, according to NBC.

The NYPD is now trying to determine where the box came from, CBS added.