The properties in Billericay, Canvey Island, Brentwood and Benfleet are all linked to an organised criminal gang believed to be involved in the distribution of class A drugs.
Officers discovered substantial quantities of drugs – including more than 650 wraps of class A substances found in two cars outside a property in Canvey Island – and recovered approximately £100,000 in cash, some of it encased in concrete.
A number of weapons, mobile phones and bags of counterfeit clothing were also seized.