A man was left unconscious after being assaulted outside a Leeds nightspot.
The incident happened at just after 3.30am in the early hours of this morning (Sunday), outside the Club Mission nightclub.
The 23-year-old victim, from Wakefield, suffered head injuries after been assaulted by two men.
He was taken to Leeds General Infirmary where he remains in a critical condition.
A second incident involving the same men happened approximately four minutes later, adjacent to the club where the man was assaulted.
The two males officers want to speak to in connection with the incident are thought to have walked down Heaton’s Court towards Lower Briggate.
Detective Chief Inspector Steve Snow of the Protective Services (Crime) department, said: “This happened at a busy time of the night when there were lots of people around enjoying a night out. I would appeal directly to anyone who witnessed this to call police on 101.”