Two men have been arrested after a multiple stabbing left one man dead and three other people injured, police say.
Emergency services rushed to Thorpe St Andrew, Norwich shortly after 7:35pm on Wednesday after reports of a disturbance.
Armed officers arrived to find four people with injuries, Norfolk Police said.
Despite treatment, one man was pronounced dead at the scene.
Three other people were taken to hospital with suspected knife wound injuries, the force added.
Two men were arrested at the scene in connection with the incident and a murder probe has been launched.
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Superintendent Tracey Little said: "A number of police resources, including armed units, were deployed to the scene.
"A murder investigation has been launched and we are in the early stages of our enquiries to establish the circumstances surrounding the incident.
"We would like to hear from anyone who may witnessed the incident or has information concerning it."
A police cordon was put in place at the scene in Primrose Crescent while enquiries were carried out.
Around a dozen officers attended the incident reports say, with an air ambulance also called.
Anyone with information about the incident should contact Norfolk Police on 101.
Thorpe St Andrew is a small town located to the east of Norwich, with a population of around 15,000 people.