Seven teenagers have been arrested following the murder of a 52-year-old who was stabbed with a screwdriver in a busy city centre in what police said was a "chance encounter". Northumbria Police 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. The local man, who was not known to the youths, was attacked inside the doors of an entrance to the shopping centre, close to a Greggs bakery. 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.