The message from the Met Police came loud and clear - and very early in the morning. Hundreds of officers making over 100 arrests in dawn raids aimed at keeping trouble away from this weekend's Notting Hill Carnival.
Officers targeted suspected gangs, seizing cash and weapons. But today's high visibility raids were just one part of the operation -- police are keeping a close eye at what's going on online too, as Piers Hopkirk reports.
More top news
Police in Southwark are appealing to the public for help in finding a teenage girl missing from Bermondsey.
Over 40,000 people picked up their packs to take part in the annual marathon in the capital.
The boyfriend of reality TV star Ferne McCann has been arrested on suspicion of attempted murder following an alleged nightclub acid attack.