Meanwhile, an events firm which offers people the chance to experience what it's like to take part in a riot has been accused of encouraging street violence.
People can also take on the role of police officers, in full body armour. One MP has described it as "completely wrong" and "unacceptable", especially in light of last year's disorder in Birmingham. Lee Comley reports.
More top news
It's been 12 years in the making but the spacecraft Rosetta's mission has finally come to an end. Here is what you need to know about it.
Sunshine and scattered showers, some heavy. Feeling a little cooler.
Sunshine and occasional heavy, sometimes thundery showers today.