A man who suffered serious injuries was found in the toilets by police at KFC in Stacey Bushes
The incident occurred at around 11.40pm on Saturday at the KFC in Stacey Bushes Trading Centre on Erica Road, Milton Keynes.
Officers were called to reports of a fight in progress between a group of up to seven men.
On arrival, officers located an injured man in the toilets of the KFC with serious head injuries.
The man was taken to hospital, where he remains in a critical condition with multiple fractures to his face and head.
Investigating officer Detective Constable Hollie Cromarty, of Force CID based at Milton Keynes police station, said: “We are investigating this as an incident of grievous bodily harm, and are appealing for anybody who witnessed the altercation to make contact with police.
“I am particularly keen to hear from anybody who can help in identifying the offenders or who may have mobile phone footage of the incident, and from anybody who was in the area in the time leading up to the assault that may have information.
“The victim’s next of kin have been made aware, and the victim is being treated for serious injuries in hospital.
“I am urging anybody who has any information to call the 24-hour non-emergency number 101, quoting reference 43190158046
