Get the day's biggest stories sent direct to your inbox so you never miss a thing In May last year sickening footage appeared on social media.
It recorded the pitiful cries of a young girl screaming for her mum as she was repeatedly punched around the head and then dragged to the floor where she was kicked and punched again.
The victim was travelling on a Metrolink tram in Manchester city centre when she was surrounded by a group of teenage boys and girls.
A girl launched the horrifying attack. READ MORE: Boy, 17, beaten up on Metrolink by gang of "animals" is rescued by Good Samaritan At the time the head of Metrolink, Danny Vaughan, described the assault as 'totally unacceptable' and vowed to help police identify the culprits.
Read more on manchestereveningnews.co.uk