Police have named a man who was stabbed to death with a screwdriver in a busy city centre.
Police have arrested seven teenagers following the murder of 52-year-old Peter Duncan.
The force said one boy aged 14, two 15-year-olds and four 17-year-olds were arrested after the "unprovoked attack" in Old Eldon Square, Newcastle, at around 6.20pm on Wednesday.
Mr Duncan, who was not known to the youths, was attacked inside the doors of an entrance to the shopping centre, close to a Greggs bakery, in what police said was a "chance encounter”.
He was taken to the Royal Victoria Hospital where he died. He had suffered a single stab wound to the chest and police believed a screwdriver was used.
Police search teams were scouring a cordoned-off area of Old Eldon Square outside the shopping centre.
The entrance to the mall had been closed off to the public but reopened on Thursday morning.
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Chief Superintendent Ged Noble said the area was busy with shoppers and people going home from work at the time of the unprovoked attack.
He declined to say whether the victim had intervened to stop a fight among group of young people.
Old Eldon Square is an area around a war memorial where groups of youngsters regularly gather.
Mr Noble said the incident was not linked to "the vagrant community" and said those arrested were known to police.
He said: "Our investigation is ongoing but we have very quickly arrested seven teenagers in connection with the incident, one of which we believe to be the main suspect.
"It appears to have been a chance encounter between the victim and the offender which then led to what appears to have been an unprovoked attack.”
He said extra patrols will be carried out in the area to reassure the public.
Mr Noble praised shoppers, diners and people going home from work who helped the emergency services.
He said: "We have had a fantastic response from the public, both in terms of immediate assistance that was given to the victim in support of ourselves and paramedics, and we have had numerous contacts from witnesses describing what they have seen.”
Anyone else with information is asked to call 101.