A total of 29 addresses have now been searched and 24 people arrested.
Cash, jewellery, an imitation firearm and several cars have also been seized by officers - along with what detectives believe to be class A drugs.
Deputy Chief Constable Paul Brandon said: "These pre-planned warrants come as a result of a long-standing and complex investigation by the Kent and Essex Serious Crime Directorate into the supply of class A drugs in the county."