Eight police raids across west London have struck a « massive blow to an established gang », the Metropolitan Police said.
A submachine gun, ammunition, cash and suspected Class A drugs were seized in the raids in Northolt, Greenford, Fulham and Brentford.
Nine people – including a 14-year-old boy – have been held on suspicion of drug and firearms offences.
Det Insp Driss Hayoukane claimed the « MDP » gang had « corrupted children ».
During a search in Stephendale Road, Fulham, officers found a Skorpion submachine gun, along with another handgun, 40 rounds of ammunition, and a kilo of suspected Class A drugs, Scotland Yard said.
Overall, six males and three females, aged between 14 and 49, were arrested in the early hours of Thursday and are now in custody, according to the Met.
The operation was the result of about six months of planning by the Met’s anti-gang Trident unit, the force said.
Metropolitan Police Commissioner Cressida Dick had been on patrol in Hackney on Wednesday evening, where she said gang tensions were high after a spate of stabbings in recent weeks, including the killing of 18-year-old Israel Ogunsola.