I’m wondering if the “gang of teenagers” is a gang of Muslims.
Probably not. The article uses the term "Yob" which generally describes drunken, white teenagers and young men who commit crime and violence for sport. Think "A Clockwork Orange." White "Yobs" or "Chavs" are known as the "ASBO Generation" and figure in much of Britain's violent crime in the last 10 or 15 years.