Three people were arrested in Hartlepool on Sunday (March 12) in connection with the murder of a man in Leeds.
A 21-year-old man has been arrested on suspicion of the murder of Peter Wass, 29, in the Chapeltown area of Leeds on 2 March.
Two females, aged 17 and 48, have also been arrested on suspicion of assisting an offender.
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A police spokesman said: "Three people have been arrested in Hartlepool this morning (Sunday, March 12 ) in connection with the murder of a man in Leeds.
"A 21-year-old man has been arrested on suspicion of the murder of Peter Wass, 29, in the Chapeltown area of Leeds on March 2. Two females, aged 17 and 48, have also been arrested on suspicion of assisting an offender.
"All three remain in custody at this time."
Mr Wass, aged 29, from Roundhay, was pronounced dead at hospital after being stabbed in an incident in the street near the junction of Hamilton Place and Hamilton Avenue in Chapeltown at about 2.30pm on March 2.
Officers from West Yorkshire Police Homicide and Major Enquiry Team are continuing to carry out extensive enquiries to establish the full circumstances surrounding the incident and to identify those responsible.
Senior Investigating Officer, Detective Chief Inspector Sam Freeman said: "Peter’s family are completely devastated at his death in such sudden and violent circumstances, and we have specially trained family liaison officers supporting them as we continue to progress the investigation into his murder.
"His family are urging anyone who knows anything about the circumstances surrounding Peter’s death to support the police investigation so that they can get the answers they need.
“They have also asked that people respect their privacy at what is understandably a very difficult time for them.”
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 Preesall reference 13230122209 or online at www.westyorkshire.police.uk/101livechat
Information can be given anonymously to the independent charity Crimestoppers on 0800 555 111.
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