Police are appealing for witnesses to what is believed to be an unprovoked assault in Mexbrough.
A 32-year-old man was walking in New Street at about 2.30am on Wednesday 22 January when he was approached by two men.
He was assaulted by the suspects, who were both wearing dark clothing, and sustained a small puncture wound to his arm.
Nothing was stolen in the incident and victim was treated at hospital for his injuries.
Detectives have been conducting extensive enquiries in the area, trawling CCTV and speaking to residents, and are keen to hear from anyone with information about the incident.
Anyone who saw two men acting suspiciously in the New Street or James Street area, or who knows anything about the assault, are asked to call South Yorkshire Police on 101, quoting incident number 60 of 22 January 2014.