A fire has broken out at a 12-storey building under demolition near London Bridge.
London Fire Brigade (LFB) is at the scene of the fire on King William Street, close to the bridge. Photographs on social media show flames behind the scaffolding on the site.
The brigade confirmed four fire engines had been sent to the address.
About 10% of the scaffolding on the 10th floor is alight, a spokeswoman said.
Firefighters were called to the site on the north side of the River Thames, in central London, at about 18:06 GMT.
The bridge has been closed to traffic and pedestrians and buses are being diverted.
BBC reporter Alan Soady, who was at the scene, said: "The building is covered in scaffolding with white netting. You can see that there are flames behind it.
"It seems, from the many fire engines that are here, they have been bringing it under control," he added. "But it has had the impact of having to cordon off the whole bridge."
"They'd have been worried about any burning debris falling down onto the path and the road that's so busy during rush hour."