Police are searching for witnesses to a Fortitude Valley bar fight in which part of a man’s thumb was bitten off.

Two men, aged 48 and 53, fought at Cru Bar on James Street just after midnight on April 14, police said.

During the fight, the younger man had part of his thumb bitten off.

Police released security footage of the brawl to try to find two people, a man and woman, who are shown sitting nearby when the fight broke out.

Police said they were hoping to confirm the circumstances leading up to the fight.

Both men involved in the fight were continuing to assist police with their inquiries.

Police have urged the pair, along with anyone else who may have seen the fight and the events leading up to it, to contact police.