A woman was attacked in an alleyway late on Thursday afternoon.
The victim was walking between Hadley Place and Clapham Place in Bradwell Common at 5pm when she was approached by an unknown man. He truck her twice on her left forearm before fleeing, leaving her with bruising to her forearm.
The man is described as white, between 5ft 10ins and 6ft tall, in his early twenties, of medium build and with short hair. He was wearing a light coloured zip-up top and jeans.
Anyone with information should call Thames Valley Police 24-hour enquiry line on 101.
Alternatively call Crimestoppers, anonymously, on 0800 555 111.