A man was left with a bleed on the brain following a scuffle outside a Blackpool bar.
Detectives are appealing for witnesses to find out how the 41-year-old suffered his injuries.
One of the males who has been ejected has ended up sustaining a head injury
He was among a group of people who were kicked out of Ma Kelly’s, on Talbot Road, on December 23.
Police say the group became involved in a ‘disturbance’ with door staff at around 9.20pm who refused to let them back in.
Several bystanders then started to intervene before the man ended up on the ground with a head injury.
Det Sgt Kathryn Riley, of Blackpool CID, appealed for anyone in the area, who saw the incident, to get in touch.
Police have already spoken to several witnesses who were in the area and said the man was already on the floor when they arrived.
Det Sgt Riley added: “There has been a group ejected from Ma Kellys by door staff and, basically, there has been a disturbance between this group and door staff, who tried to prevent them re-entering.
“There are lots of members of the public who all tried to intervene in various ways.
“One of the males who has been ejected has ended up sustaining a head injury.”
It is not clear whether an offence has taken place or if the injury was accidental.
Police have since been carrying out CCTV inquiries to identify witnesses who were in the area at the time.
Some have been spoken to but Det Sgt Riley said there were others who may be able to help.
The man, 41, was treated for a gash to the back of his head and a ‘minor’ bleed on the brain, police said.
Det Sgt Riley said there were ‘no fractures of broken bones’.
She added: “It is not clear how he sustained his head injury and I would urge anyone who witnessed this incident to get in touch.”
Anyone with information is asked to call police on 101, qutonig log number 1372 of December 23.