Police have released images of 22 men they want to trace after a large-scale fight in Sheffield.
The disorder took place on Woodbourn Road on 25 May last year, South Yorkshire Police said.
A force spokesperson said officers believed it involved two groups from the Eritrean community, with one faction supportive of Eritrean independence and the other in opposition.
Eighteen people have so far been charged with offences including violent disorder, possession of an offensive weapon and wounding, they added.
According to police, the group opposing independence travelled into the area to target an Eritrean Independence Day celebration taking place at the Pakistan Muslim Centre.
A group of about 200 people gathered at the location, where violence involving weapons erupted both inside and outside the centre and on the surrounding streets.
The centre was damaged along with vehicles parked nearby.
Multiple people were injured in the fight, according to police
The spokesperson said "multiple" people were injured, including some seriously who required hospital treatment.
Det Insp Lee Wilson said the force's investigation had been "moving at pace".
"We will continue our inquiries until we have brought the people responsible before the courts, to be held accountable for their actions," he added.
Pro and anti Eritrean independence groups are said to have clashed
