This horrific footage shows a teenager kicking and punching another girl as she begs for somebody to call her father.
Video shows the victim being pulled to the ground where she is repeatedly struck in the head and body.
The assault on August 3 in Birmingham is so vicious that at least one onlooker tries unsuccessfully to pull the attacker away.
The clip, believed to have been recorded in Ley Hill Park, was obtained by the victim's uncle, who posted it to social media with the caption: 'I want to name and shame this girl because police not doing anything as usual.
'I wasn't going to put this up but the girls are threatening her every night saying they were going to stamp on her head, and come down to my house and family business causing more trouble, and police can't do anything because she is a minor.'