33-year-old Christopher Palumbo walked out at about 4 p.m. after being brought in by the NYS Office of Mental Health Police.
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He left on foot heading in an unknown direction, police said.
Clarkstown Police set up a command post where they searched for the prisoner into the night.
On Monday evening Palumbo was spotted running across N. Main Street in New City, and was subdued by officers.
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He was taken back to the Rockland Psychiatric Center.
Police said Palumbo was not believed to be armed.
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