The City of London is becoming a magnet at the weekends for vicious gangs involved in shootings, drug dealing and extortion.
Where once the Square Mile would be deserted at the end of the working week, now tens of thousands of party-goers travel to clubs that hold more than 1,000 people.
Among them are rival gangs, who over the past two years have been attracted by lax parking restrictions and the relatively low number of officers available to patrol the area. Some are drug dealers seeking to take control of valuable new markets, while others are looking to settle scores.
Each gang follows a different DJ and because each club can book several DJs they overlap, as do their followers, leading to violent clashes.