An altercation outside Galleywood Social Club, The Street, Chelmsford just after 11.15pm on Saturday November 3 has left a man with serious injuries.
Two people were taken to hospital, a women in her 20s and a man in his 40s.
The man remains in a critical condition.
Police would like to speak to anyone who was at the social club and has yet to speak to officers or saw the incident.
If you have any information about the incident, dash cam or mobile footage please call 101 quoting incident 1490 of Saturday 3 November or Crimestoppers anonymously on 0800 555 111.