It happened around 7 a.m., as the woman was opening the Castle Hill Post Office on Castle Hill Avenue.
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Authorities say the victim was knocked to the ground and hit over the head with a gun before the man demanded she open the gate.
The man, dressed in all black and wearing a full facemask, ran inside the post office and made off with, according to sources, $112,000 in cash, 10 boxes of money orders, and a machine used to print those money orders.
He fled in the scene in a white minivan.
The postal employee was treated on-scene by EMS and was not seriously injured.
The victim's husband was walking back to his car after having dropped her off when his wife was assaulted, and he rush to her aid.
He was also held at gunpoint but was not injured.
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"The safety and security of Postal employees is a top priority of U.S. Postal Inspection Service," the organization said in a statement. "The Postal Inspection Service is leading the investigation with support from NYPD and the FBI to locate and apprehend the individual responsible for this crime."
Anyone with information is asked to contact Postal Inspectors at 212-330-5266 or the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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