A murder investigation has been launched after a man in his 20s was stabbed to death at a flat where a party had taken place overnight.
Police said officers were called to a report of a fight and a man being stabbed at the property in the New England area of Peterborough, Cambridgeshire, at about 5am on Saturday.
Crime scene tape continued to surround the property at midday and forensics officers were carrying out an investigation, CambridgeshireLive reported.
No-one has been arrested.
Police say they are keen to speak to anyone who was at the flat earlier in the evening or any taxi drives who picked up passengers at that location.
A spokesperson for Cambridgeshire Constabulary said: "A murder investigation has been launched in Peterborough following the death of a man in the early hours of this morning.
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"We were called out to a flat in Crown Street, New England, at about 5am where it was reported there had been a fight and a man had been stabbed.
"It is believed the victim is a man in his 20s however formal identification is yet to take place."
DCI Emma Pitts, from the Beds, Cambs and Herts Major Crime Unit (MCU), said: “No arrests have been made at this time however we are in the process of speaking with a number of potential witnesses.
“We are aware a party had taken place at the flat and some people may have left.
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“My plea is for anyone who may have information and we have not yet been in contact with, to get in touch with us as a matter of urgency.
"I am also keen to speak with anyone who may have been at the flat earlier in the evening or any taxi drivers who collected fares from the location.”
Anyone with information is asked to contact police via their webchat service or online forms, quoting incident 82 of May 8.
People can also call 101 quoting the same incident number.