A man was stabbed twice in the back after being punched to the floor during a three-on-one attack in a Stoke-on-Trent street.
The suspects were described as three youths, around 16 or 17 years old.
The victim remains in hospital, and police say they need witnesses to the incident, in Mellor Street, Packmoor, at around 8pm on Wednesday (January 6).
They are now keen for anyone with any CCTV or dashcam footage from the area to come forward.
The officers have now released descriptions of the alleged offenders to help with the investigation.
A Staffordshire Police spokesman said: “The attackers are described as three youths, all aged around 16 to 17.
“One is described as white and wearing a grey tracksuit and blue face mask. The second as white and 5ft 6ins tall and wearing a black tracksuit.
“A third youth is described as black, 5ft 9ins tall, with shoulder-length dreadlocks, and wearing a black tracksuit.”
Anyone with any information is asked to contact Staffordshire Police on Facebook, Twitter, or by calling 101 quoting incident 601 of January 6.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.