A man was stabbed to death and three others suffered knife wounds during a street fight between two groups of people, police said.
Officers were called to Marine Terrace in Folkestone, Kent, just before 8.30pm on Monday after the large brawl erupted outside a house party.
Four people were rushed to hospital with stab wounds following the clash between the two groups of people from Middle Eastern origin.
One of the victims later died from his wounds, while another remains in a critical condition.
Kent Police have detained one man in connection with the incident and said officers expected to make a number of other arrests.
A police spokeswoman said: “We are continuing to investigate a large disturbance which began at around 8.30pm(on Monday). It is believed that a group of men gathered outside a flat in Marine Terrace where a party was being held.
“A fight took place between the group outside and the people from the party. Four people sustained stab wounds and were taken to hospital. Several other people also sustained a range of injuries.”
Marine Terrace remains closed off while police investigators scour the crime scene for clues. Diversions have been put in place around the street.
Chief Supt Chris Hogben said: “We are investigating this serious incident which appears to be the result of a dispute between two groups of Middle Eastern people. We also have specialist officers working within the community to reduce these tensions.”
Detectives have already spoken to a number of witnesses, but appealed for anyone else with information to come forward.