A Philadelphia police lieutenant has been caught on video striking a woman in the face at a neighborhood party associated with the city's annual Puerto Rican Day parade.

Woman who says she was hit by a Philadelphia police officer is escorted away (YouTube)

Police officials have launched an internal investigation into Sunday's incident in north Philadelphia.

A video uploaded to YouTube depicts the woman crumpling to the ground after being struck. The woman appeared to be bleeding from the mouth as she was led away in handcuffs.

Moments before the woman was hit, the video shows someone else throwing a liquid substance toward the officers. The woman was also seen spraying something from a can.

Police spokeswoman Officer Tanya Little says the woman was cited for disorderly conduct.

The officer was identified by Fraternal Order of Police officials as highway patrol supervisor Lt. Jonathan Josey.

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