Two teenagers pinned a terrified Brierfield woman against the wall and demanded her mobile phone before ripping her blouse.
The 46-year-old victim was walking in a back street in Sefton Street around 9.30pm on Thursday.
She fought off the boys before fleeing.The offenders are described as Asian, aged about 14 to 15 and 5ft 8in.
One was wearing a white Adidas hooded top and dark tracksuit bottoms. The other was wearing a grey hooded top and grey or black tracksuit bottoms.
Anybody with information should contact police on 01282 425001.
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