A person with knowledge of the investigation says an NYPD police deputy inspector violated department guidelines when he used pepper spray on Occupy Wall Street protesters last month.

The video from the Sept. 24 incident shows Deputy Inspector Anthony Bologna blasting a cluster of women with pepper spray. Two of the women crumple on the sidewalk in pain. One screams.

A source confirmed to NBC New York an internal NYPD review found that Bologna violated department standards on pepper spray use.

The investigation findings were first reported by The Associated Press.

Bologna has been docked 10 vacation days for the violation, the source said. He may choose to appeal the decision.