A young man stabbed to death in a bar brawl at the weekend had come to London to watch the League Cup final, police have said.
Alex Jarmay from Bromborough in Merseyside travelled to the capital with a group of friends to watch Liverpool take on Cardiff in the Carling Cup final at Wembley Stadium on Sunday.
But the night before the game, the 26-year-old was stabbed in the chest at Bar Uno in Camden and pronounced dead at the scene.
Scotland Yard detectives, who have launched a murder investigation, said neither Mr Jarmay nor any of his group were wearing football colours or acting in a way which would identify them as football supporters.
They added that there was no evidence the incident was sparked by football rivalry, the Press Association reported.
A 17-year-old boy and three men aged 23, 25 and 28, all from the London area, were arrested at the scene in connection with the incident.
Detective Chief Inspector Matt Bonner, from Scotland Yard's homicide and serious crime command, said: "This is a tragic incident which has resulted in a young man losing his life.
"Our sympathies are with Alex's family and friends and I would like to assure everyone that my team is working tirelessly to identify those responsible.
"I would like to reiterate my appeals for anyone who was in the area to come forward and speak to my officers with any information you may have."
Jarmay was killed shortly before midnight at the bar on Inverness Street.
A post-mortem examination carried out yesterday at St Pancras mortuary gave the cause of death as a stab wound to the chest.
The men and teenager arrested remained in custody at north and central London police stations on monday night.