The 15-year-old was stabbed in the neck with a foot-long knife near the Whitgift shopping centre in Croydon, south London, during the morning rush hour, a witness said.

A 17-year-old boy, who knew the victim, was arrested just over an hour after the attack which took place on busy Wellesley Road at around 8.30am on Wednesday.

Elianne's family said in a statement: "Our hearts are broken by the senseless death of our daughter.

"Elianne was the light of our lives. She was bright and funny, with many friends who all adored her.

"She was only 15, and had her whole life ahead of her, with hopes and dreams for the future.

"All those dreams have now been shattered. Our lives have fallen apart, along with that of our wider family.

"We ask the media to please respect our privacy as we try to grieve the short life of our beautiful child."

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Detectives have recovered CCTV footage from the area and spoken to witnesses, while forensic scientists have examined the scene and a postmortem is taking place on Thursday afternoon.

Police said officers were confident Elianne, who attended the Old Palace of John Whitgift School, was attacked near the bus stop in Wellesley Road and are trying to establish her exact relationship with her alleged attacker.

Detective Chief Inspector Rebecca Woodsford, who is leading the investigation, said: "My thoughts and the thoughts of my team are with Elianne's family. This is a deeply upsetting time for them and we will do everything we can to support them."

Elianne was pronounced dead at the scene at around 9.20am, while the suspect, who was held in nearby New Addington, remains in custody. Police have been given an extra 12 hours to question him.

DCI Woodsford said: "We know many people were in the area at the time and would have witnessed the attack. This would have been distressing and traumatic and I would encourage anyone who needs support to contact us and we will help to arrange this.

"I know that Elianne's death has left many people feeling upset and I would like to thank the people of Croydon for the support they have shown us as we have carried out our inquiries in the town centre. I know this work has been disruptive, however it has been vital and your patience is appreciated."

Tributes have poured in for Elianne, with dozens of bunches of flowers, cards and candles left at the scene, while a large police cordon remains in place.

London-born actor Idris Elba has called for "tougher deterrents and punishments" to be enforced on those who carry weapons.

The Wire and Luther star, who has previously campaigned against knife crime, sent his condolences to Elianne's family.

He wrote on Instagram: "It is a shame that out country still mourns the deaths of children at the hands of knives."

Officers who were among the first at the scene and battled to try to save her appeared visibly moved as they laid flowers on Thursday.

Mayor of London Sadiq Khan said: "I have spent the morning in Croydon meeting local residents, youth workers, community leaders, police officers and others.

"That is a community shocked, traumatised and heartbroken. I'm sure I speak for everyone when I say our thoughts are with her family and friends."

Adama Dumbuya, 30, a family friend of the girl, said: "It's just really sad. She was such a lovely little girl. I'm a parent myself.

"She was just really lovely the few times I've met her. She's just a very nice girl and very polite."

Anthony King, chairman of My Ends - a project helping combat youth violence in Croydon - said the boy had been known to local community groups for the past couple of years.

Mr King was with the girl's family after the incident and said they were "heartbroken".

He added: "She had a bright future ahead of her. She was in her GCSE year."

Mr King described the girl as an "absolutely incredible young lady" and told of how others said she was "jovial, very comedic".

One of the cards, left near the site of the attack, read: "Sorry we live in this crazy world. This makes no sense.

"Fly high up there, my mummy will look after you. RIP beautiful, forever young, taken too soon.

"Thoughts and prayers are with your family and friends, God bless."

'The blood was coming like water'

A bus driver and a passer-by were seen desperately trying to save Elianne before emergency services arrived, with police at the scene within two minutes.

Victor Asare, 50, told how he saw a boy stab her in the neck with a knife which was "black, thin and about a foot long".

"The boy wore a black blazer, the girl wore green. It looked like the girl didn't want the boy to come closer," said the security worker. "The blood was coming like water."

He said the boy ran away and "everybody was crying and screaming", adding: "The girl was on the floor.

"We tried to catch him and a lot of people tried to save the girl. I was so shocked, I was shaken. It's somebody's daughter."

A mother of two, who wanted to be named only as Bridget, said: "I was on the bus before and came off and walked back down, I saw them resuscitating her.

"The driver was holding her, and a lady. The emergency services were already here when I walked back."

She said two other schoolgirls, believed to be the victim's friends, were trying to get through the police cordon but were held back.

The Old Palace of John Whitgift School has said in a statement: "We are deeply shocked by the senseless and tragic death of our much-loved and valued friend and pupil.

"It will take some time for the Old Palace community to come to terms with this terrible news, and we will offer support to our pupils as we try to do so.

"Above all, we send our love and deepest sympathies to the girl's family at this unimaginably distressing time."