One Direction star Liam Payne escaped unharmed after a fire broke out at his home but three others were taken to hospital with injuries.
The singer was in the flat on the 34th floor of a luxury block in Canary Wharf, in London's Docklands, when firefighters were called.
Two men and a women were treated for burns after a blaze started on the balcony but a spokesman for the star said he was unharmed.
Station manager Laurie Kenny, from London Fire Brigade, said: "Firefighters worked quickly and professionally to get the fire under control as quickly as possible.
"Around 30 people left the building before we arrived and were not injured. Two of the occupants had superficial burns to their hands and the third had burns to his hands and face. All three have been taken to hospital."
Six fire engines and 35 firefighters were called to the scene. The cause of the fire is being investigated.
Niall, Louis and Liam from One Direction have spoken to ITV News ahead of the world premiere of 'One Direction: This is Us' at Leicester Square in London.
Hundreds of One Direction fans have arrived in Leicester Square in London ahead of the boyband's film premiere.
One fan from the West Midlands was the first fan in the queue.
Dani Pring said it felt good knowing that she was the first person to arrive.
One Direction have arrived for the premiere of their film This is Us. To watch a livestream of the event, click here.
Read more on the launch of the band's first film here.
Thousands of One Direction fans are expected at tonight's premiere of the boyband's first film.
It is called One Direction: This Is Us, and it follows their life on the road during their rise to worldwide fame.
Leicester Square is "full to capacity" thanks to the One Direction film premiere, according to this Transport for London sign.
One Direction's feature film This Is Us has great odds to become the UK's highest grossing film ever, according to bookmakers Ladbrokes.
As the premiere launches tonight, bookies are speculating at its potential success and make it a 5/1 chance to win a BAFTA award for Outstanding Debut in 2014.
The film chalked up at 4/1 to be the country's highest-grossing film ever, beating the record set by Skyfall in 2012.
Jessica Bridge of Ladbrokes said: "One way or another this film is going to break records and win awards. The 1D phenomenon is showing no signs of slowing down and the odds suggest they could be adding a BAFTA to their tour bus mantelpiece."