A 17-year-old boy has been stabbed to death in Leeds.
A further call was received from the ambulance service who were responding to a male reported to have been stabbed at the address.
Officers attended and dispersed people from the area around the address, and the victim, a 17-year-old boy from Leeds, was taken to hospital where he was pronounced dead a short time later.
Detectives from West Yorkshire Police Homicide and Major Enquiry Team are treating his death as murder.
A scene remains in place around the address in Salisbury Grove to undergo forensic examination and specialist searches.
Senior Investigating Officer, Detective Chief Inspector Alan Weekes said: “The loss of a young life in such sudden and violent circumstances is an absolute tragedy, and we are treating this incident very seriously and doing everything we can to identify those responsible.
“Our investigation is still in its very early stages, and we are carrying out extensive enquiries to build up a picture of the full circumstances of this incident.
“We are aware there were a large number of people attending a party at the address when the victim was attacked, and we are keen to speak to anyone who was there and who witnessed any part of this incident.
“We would also like to hear from anyone in the area around the time of the incident who has any relevant CCTV, phone or dashcam footage that could assist the investigation.
“We fully appreciate that this incident will cause understandable concern in the local community, and we are liaising with our colleagues at Leeds District who are working to reassure people.
“Officers from the local neighbourhood policing team will be maintaining an increased presence in the area and are keeping their local community representatives updated as our enquiries progress.”
Anyone who witnessed any part of the incident or who has any information that could assist the investigation is asked to contact the Homicide and Major Enquiry Team via 101 quoting Operation Pedalbourne reference 13230154405 or online at www.westyorkshire.police.uk/101livechat
Information can be given anonymously to the independent charity Crimestoppers on 0800 555 111.