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Disturbing new video shows a woman slugging an elderly lady in the face in an unprovoked broad-daylight attack in Midtown this week.

The 74-year-old victim was walking on Madison Avenue near East 52nd Street around 11 a.m. Wednesday when the stranger punched her in the side of the face without saying a word, according to cops and the video.

The senior fell to the ground, landing near the curb. A bystander appeared to come to her aid before the clip cut out.

The victim was taken to NYU Langone Hospital-Manhattan in stable condition.  

The suspect – who was still on the loose Friday – appeared to look back once as she stormed away from the victim. 

She is shown with her hair up and wearing a white hoodie, black shorts and carrying a black duffel bag.