Tributes have been paid to a talented cricketer and an England under-18 hockey player who were among the three people killed in Nottingham yesterday.
The two 19-year-old university students and a man in his 50s were the victims of an attacker who stole the older victim's van and attempted to run over three other people in Nottingham.
Nottinghamshire Police said a 31-year-old man was tasered and arrested on suspicion of murder and remains in custody.
Barnaby Webber and Grace Kumar were students at the University of Nottingham.
Grace is the daughter of consultant anaesthetist Dr Sinéad O'Malley from Dublin, who is now based in the UK.
Her grandfather is Prof Kevin O'Malley, former registrar and chief executive of the Royal College of Surgeons in Ireland.
Her father Sanjoy Kumar is also a doctor.
She moved to Nottingham to study medicine at the city's university.
Ian Coates, a school site manager, has been named as the third victim. He was found stabbed to death on Magdala Road.
Mr Webber's family have described their "complete devastation".
In a statement, his parents David and Emma and younger brother Charlie said: "Complete devastation is not enough to describe our pain and loss at the senseless murder of our son.
"Barnaby Philip John Webber was a beautiful, brilliant, bright young man, with everything in life to look forward to.
"A talented and passionate cricketer, who was over the moon to have made selection to his university cricket team.
"At 19 he was just at the start of his journey into adulthood and was developing into a wonderful young man.
"As parents we are enormously proud of everything he achieved and all the plans he had made.
"His brother is bereft beyond belief, and at this time we ask for privacy as a family to be allowed time to process and grieve."
In a statement, Taunton-based Bishops Hull Cricket Club paid tribute to Mr Webber, who was one of its members, describing him as a "dear friend".
He was described as a "key part" of the club and the statement invited family and friends to lay flowers and pay their respects at the ground.
Former England cricket captain Michael Vaughan also paid tribute to Mr Webber, describing him as a "young cricketer gone far too soon".
Ms Kumar was a popular member of England hockey teams, the sport's governing body has said.
England Hockey tweeted: "We are all deeply saddened by the news of the tragic death of Grace Kumar in Nottingham on Tuesday.
"Grace was a popular member of the England U16 and U18 squads and our thoughts are with Grace's family, friends, teammates and the whole hockey community at this time."
Woodford Wells Cricket Club, in Essex, said Ms Kumar was "fun, friendly and brilliant".
"Devastated to hear the news about former Wells Baby Belles captain, Grace Kumar," the club Tweeted.
"A fiercely competitive, talented and dedicated cricketer and hockey player.
"Our thoughts are with Sanjoy, Sinead and James at this time and everyone who knew Grace - fun, friendly and brilliant."
Ms Kumar, also known as Grace O'Malley-Kumar, attended independent Bancroft's School in northeast London before the University of Nottingham.
Mr Coates, who worked as part of L.E.A.D Academy Trust, was described by Huntingdon Academy and Warren Academy's executive headteacher as "a much-loved colleague who always went the extra mile for the benefit of our children".
Chief Constable Kate Meynell told reporters the force were not looking for anyone else in connection with the incidents and no further arrests had been made.
The two students were fatally stabbed on Ilkeston Road, a student area of Nottingham, at about 4am.
Ms Meynell said the body of the man in his 50s was found in Magdala Road.
All three were found dead in the street by members of the public, police said.
In a short statement issued yesterday afternoon, Ms Meynell said police believed the attacker stole the older man's van before driving it at pedestrians in Milton Street.
The vehicle was stopped by officers in Maple Street before the suspect was tasered and detained, Ms Meynell said.
Three people were injured in the van attack, with one in a critical condition in hospital and two suffering minor injuries.
The police chief said the motive behind the attack was yet to be determined, but officers were keeping an "open mind" and working with counter-terror police.
A vigil at Nottingham's St Peter's Church, in the city centre, was attended by hundreds of people paying their respects to those who died and those injured.
During the service, attended by mainly students from both the University of Nottingham and Nottingham Trent University, those present were invited to place flowers below the altar or light a candle.
Throughout the day yesterday, witnesses gave harrowing accounts of the attacks, with one telling the BBC he heard "awful, blood-curdling screams" and saw a "black guy dressed all in black with a hood and rucksack grappling with some people".
Ms Meynell confirmed officers had carried out searches at a number of properties around the city, with cordons seen being put up on various sections of Ilkeston Road.
Home Secretary Suella Braverman said "we're in a very early stage of the investigation" when asked whether the attack could have been terror-related.
She told broadcasters in Westminster: "We need to allow the police the time and the space to carry out all of their operational activity to determine the motive.
"It's right that Nottinghamshire Police are working with Counter Terrorism Policing. But it's also fair to say that everybody and all professionals on the front line are keeping an open mind as to what the precise motive might have been."
