"Becky Smith was beaten unconscious on May 9 near her home in Blackley, Manchester. She was treated in hospital for severe concussion and nerve damage to her legs.
The attackers filmed the assault on a mobile video phone - a craze known as "happy slapping". The images are exchanged on mobile phones or posted on the internet. A 16-year-old girl, from Blackley, was arrested today on suspicion of assault."