Detectives have been given the descriptions of four men who they believe could be suspects in connection with an assault in Westcliff on Friday, July 28.
Officers were called by ambulance staff to an address in Balmoral Road, Westcliff, shortly after 10.30pm that evening, with reports that a man had been stabbed.
The 21-year-old victim had been stabbed a number of times and was taken to hospital in London.
It is believed the attack happened in nearby Salisbury Avenue, and a search of the area was conducted by officers.
The victim remains in hospital and is being treated for injuries which are serious, but not believed to be life threatening.
The first suspect was described as having fair skin, and possibly of Turkish background. He was 5ft6ins tall with a short back and sides haircut. His hair was dark brown and he had facial stubble, with a half grown moustache. He was of slim build, estimated to be in his early 20s and was wearing dark jeans and a grey hooded top.
Another suspect was thought to be between 5ft8ins and 5ft9ins tall, was wearing a hooded top and balaclava and had a white piece of material covering his nose. He was thought possibly to be white, of slim build and around 20 years old.
Another man was wearing a hooded top with a white balaclava up to his eyes. He was also believed possibly to be white, of slim build and about 20 years of age. He was described as between 5ft6ins and 5ft7ins tall.
The last man police have a description of was also between 5ft6ins and 5ft7ins tall and described as being of chubby build with dark skin. He was also wearing a balaclava and a hooded top.
Enquiries continue, into what police believe is an isolated attack.
Anyone with information is asked to contact Southend CID on 101, or Crimestoppers anonymously on 0800 555 111.