Drugs, a gun and a stolen car were found during police searches on Canvey.
Officers carried out warrants at an address in St Johns Crescent, a caravan in St Agnes Road, and a boat at Small Gains Marina on yesterday.
During the searches, police found a suspected firearm, substances believed to be class A and B drugs, a Taser and a suspected CS spray.
Officers also recovered a Jaguar X6 stolen from Vange overnight on Tuesday, October 23.
Four people have been arrested after three warrants were carried.
A 53-year-old man was arrested on suspicion of possession of drugs with intent to supply, possession of firearms offences, possession of drugs, and burglary.
A 23-year-old man, 17-year-old girl and 45-year-old woman were arrested on suspicion of possession of drugs with intent to supply, possession of firearms offences and burglary.
All four, who are from Canvey, were released under investigation while forensic tests are completed and police continue enquiries.
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