Teenager arrested after child "falls from height" at the Tate Modern in London

After the fall on Sunday afternoon the boy was flown to hospital from the gallery in central London by air ambulance.

A Metropolitan Police statement said: "We await an update on his condition."

Police officers remain in the area following the incident, the force added.

Visitors reported on social media not being allowed in or out of the gallery while emergency services dealt with the incident.

Greg Ritchie posted a picture of the helicopter on Twitter, saying: "Nobody being allowed in or out of the Tate Modern for the last 20 minutes. Plenty of police and ambulances arriving, and a helicopter just landed. Not clear what's happened."

He later said on Twitter that after the air ambulance took off, the doors were being opened to allow visitors who had been kept inside the building to leave.

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.