A disturbance spilled out into the street in Kilmarnock town centre after two men assaulted another man leaving him with a broken jaw.
The 26-year-old man was seriously injured in the attack on a Saturday night and had to be taken by ambulance to Crosshouse Hospital.
Two men set upon the victim at around 10.20pm on May 8 in John Finnie Street near its junction with Grange Place.
The first suspect is described as a slim white man in his mid-20s to early-30s, around 5ft 10in tall. He was wearing a khaki green hat, a dark top and light coloured jogging bottoms.
The second suspect is described as a white man in his early-30s, 6ft 5in tall, and was wearing a dark coloured top and light coloured jogging bottoms.
After the attack, another incident involving several people spilled onto the road obstructing vehicles. Police are appealing for any witnesses who can help in their investigation to get in touch.
Detective constable Robert Graham, East Ayrshire CID, said: “Officers have been checking CCTV and making local enquiries since the incident, however, are now appealing to anyone who was in the area at the time to contact them.
“After the assault there was another disturbance involving a number of people where vehicles on the road were obstructed as it spilled onto the street.
“We would ask anyone who saw the initial attack or who may have been driving past and has dash-cam footage to get in touch with police.”
Anyone with information can contact officers at Kilmarnock Police Station on 101, quoting reference number 1255 of May 10, 2021. Alternatively, Crimestoppers can be called anonymously on 0800 555 111.