Police seized guns, drugs and £50,000 in cash as they raided 40 addresses in south London.
The early-morning operation targeting drug gangs saw 25 suspects arrested and 40 properties searched in Croydon, Wandsworth and Lewisham.
These included seven commercial sites that were raided in South Norwood High Street.
The 25 suspects were arrested on suspicion of various crimes including possession of firearms, possession of Class A drugs with intent to supply, and handling stolen goods.
Officers seized £50,000 in cash, class A and B drugs, as well as guns and a stun gun.