A teenager has been arrested on suspicion of attempted murder after a six-year-old boy was thrown from the 10th floor of the Tate Modern art gallery in London, police have said. The youngster is in a critical but stable condition in hospital after being flown there by London's air ambulance. A London Ambulance Service spokesman said two ambulance crews were sent to the scene, along with the Hazardous Area Response Team and the air ambulance. "We treated a person at the scene and took them to hospital as a priority," the spokesman added.

A teen was punched in the face by a witness after a six-year-old French boy was thrown off the Tate Modern’s viewing platform, it has been claimed.

The Sun reports that the young boy’s mother screamed “where’s my son?” as witnesses claimed the child was snatched from her arms and sent plunging 100ft (30 metres) from the 10th floor at the central London art gallery yesterday in front of horrified families.

Police today confirmed the little boy’s family are French, visiting London at the time of the horror.

The 17-year-old suspect reportedly had to be barricaded into the Tate Modern’s bathrooms after one man punched him in the face after witnessing the attack.

Cops swooped to arrest the teen - with claims he blamed “social services” as he was arrested on suspicion of attempted murder.

The suspect was initially thought to have been a family member of the little boy and authorities went to take him to the cafe when a witness yelled he was the culprit, the New York Times reported.

Panicked mums grabbed their own children as the terrifying scenes unfolded at the popular tourist attraction on Sunday.

Administration worker Nancy Barnfield, 47, of Rochdale, was at the 10th-floor viewing gallery with a friend and their children when her friend heard a “loud bang” as the child landed on the fifth floor.

And she chillingly claimed she had seen the suspect walking through the Tate moments before, telling the Daily Mail: “He followed us around everywhere.

“I told my kids to stay away from that man, it went on for ages. He looked about 19 to 21 years old, acting so weird.

“He had his hands behind his back the whole time, his back to the wall, just watching people. We walked away from him then immediately when he was out of sight a woman was screaming ‘My son, my son’ and people were grabbing him.”

She added that the victim’s mother had an Italian accent, saying: “We did not notice the mum before, we noticed her after because she was hysterical by then.”

The six-year-old boy today remains critical but stable - but is “no longer in a life-threatening situation” - while police continue to question the teen suspect.

But Ms Barnfield claimed the suspect remained “quite calm” as he was arrested.

She said: “He was white and unshaven and had a blue T-shirt with a top wrapped around his waist. He was unresponsive. Even with everything happening he was chillingly calm.”

‘MOTHERS GRABBED THEIR CHILDREN’

Olga Malchevska was on the viewing platform with her four-year-old son when she witnessed the little boy falling - saying it was “absolutely terrifying”.

The journalist from Ukraine said: “I was standing on the balcony with my little one and he was touching the fence and we were making pictures.”

But she said she suddenly heard a noise, with people starting to shout “Oh my God, the boy dropped”.

The little boy’s mother was on the balcony, crying, shaking and shouting “oh my son, my son”.

Another bystander, Corinne Brooks, said people started to grab their children “screaming and crying” after the horror unfolded.

The Tate Modern was the UK’s most popular tourist attraction in 2018 after being visited 5.9 million times, according to the Association of Leading Visitor Attractions.

With the schools having broken up and holiday season begun, there are likely to have been thousands of visitors to the gallery on Sunday.

Helen Jones, 46, of Manchester, said: “It was horrific. I thought there had been a terrorist attack.”

An air ambulance was seen at the gallery - flying the little boy to hospital.

Met Police this morning said officers were working hard to “establish the circumstances of yesterday’s incident”.

They said they had already spoken to some witnesses but appealed for anyone else who may have since the tragedy unfold come forward.

This story first appeared in The Sun and has been republished here with permission.