A 55-year-old woman was sexually assaulted in a park in Tottenham in the early hours of Thursday morning.
The woman was pulled at knifepoint from New Road into Bruce Castle Park, where the suspect then forced the victim touch him at around 1am.
Police believe the suspect ran off when three young men passed by and the victim was taken to the North Middlesex Hospital with minor injuries to her neck and face.
The suspect has been described as a black man in his early 20s, approximately 5ft 10inches tall wearing a white jacket with black lines down the sleeves.
Police are calling for anyone with any information that may help their investigation to get in contact.
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