Shocking images of a 60-year-old woman being brutally beaten on the New York subway by an unknown man, who hit her more than 50 times with his cane.

The attack took place at Harlem station. In the two-minute video, the perpetrator can be seen – initially – hitting the unfortunate 60-year-old woman, who is trying to defend herself, using her cane, with an umbrella. The stranger grabbed it as she fell screaming to the floor and then hit her more than 50 times on the head, stomach, legs, arms and waist with such ferocity that the cane broke.

After several blows, the 60-year-old remains motionless on the ground for a few seconds until the attacker starts kicking her. While the woman is being attacked, no subway worker or passenger intervenes or tries to stop the beating. The unidentified man fled before police arrived. It is unclear how the dispute between the two began. There were no reports of an arrest Monday night and the investigation is ongoing, New York police officials said, according to the New York Post.