Some 40 people had to flee a tower block after a fire broke out on the 17th floor.
About 40 firefighters were sent to battle the flames, which damaged part of a flat in the 21-storey building in south-east London.
The blaze was rumoured to have been caused by lightning striking the building, but firefighters could not confirm this.
One woman was treated at the scene for minor smoke inhalation by ambulance staff but there were no other casualties reported.
London Fire Brigade said it was investigating the cause of blaze, which broke out at Lupin Point on Abbey Street in Bermondsey on Tuesday afternoon.
Eight fire engines were deployed when the brigade was called just before 2pm and the fire was brought under control by 3.44pm.
Station manager Richard Welch said: "Our crews did really well to quickly gain entry into the flat where the fire started and stop the fire from spreading further than it did."
A London Ambulance Service spokeswoman said: "We can confirm that we were called at 2.02pm today to reports of a fire on Abbey Street, SE1.
"We sent a duty manager, an ambulance crew and two hazardous area response team units.
"At present our staff are treating a woman on the scene for minor smoke inhalation."
