Detectives are appealing for witnesses following an altercation in High Street, Aveley, on Tuesday September 8.
Police were called at around 1pm to reports that a man in his 20s had been assaulted by four men. The man had just gotten into his white pickup truck with a drop side when this occurred.
The four men believed to be in their 20s were driving a silver car.
This is believed to have been a targeted attack.
If anyone has any information, CCTV or dashcam footage they are asked to call Grays CID on 101 quoting crime reference 42/143388/20.
Alternatively, you can report it online at www.essex.police.uk