NYPD internal affairs investigators are reviewing a video showing an officer placing his hand on the neck of a woman in Chinatown who appeared to be trying to get away from him.

The 19 second video — which appeared on the Internet — is at least two and possibly four years old, — said a police official. It shows a woman in a confrontation with two officers beside a red passenger sedan.

“A preliminary review of the video revealed that this is not a recent incident, however it has been forwarded to Internal Affairs for further review,” said an NYPD spokesman in a statement Monday.

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The video was taken by someone in a passing car and shows the woman trying to get away from the officer who is seen placing his hand on the area of her neck on the left side. As the camera passes the scene, the woman is seen leaning against the parked red car, with her eyes closed and grimacing as the officer appears to restrain her with his hand against her neck.

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It was unclear from the video if the woman’s airway was blocked and if she couldn’t breath. It was also unclear what precipitated the confrontation.

Choke holds are not allowed under NYPD rules. Incidents of alleged choke holds by officers have been a flashpoint of criticism since the Eric Garner episode in July 2014, when the Staten Island resident died after he was put into an apparent chock hold by an officer.