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.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.