London Fire Brigade said firefighters were dealing with the flood between City Road and Islington Green in north London. Six fire engines and three fire rescue units have been deployed.
The water is at a depth of two metres in the basements of properties on Charlton Place, the fire brigade said. Multiple properties are affected and around 100 people have been evacuated. Police are using the The Steam Tavern as a refuge for residents.
Upper Street is currently closed and motorists are advised to avoid the area.
London Ambulance said there had been no injuries as a result of the flooding.
MPS Marine Policing Unit tweeted a video of the scene:
Marine units assisting with a mains leak by Camden passage N1 pic.twitter.com/1KbQvqrQJ2— MPSonthewater (@MPSonthewater) December 5, 2016
And witnesses have tweeted a range of dramatic pictures and footage of the flooding:
Burst water main on Upper Street just down from Angel Station, had to walk 45mins in the cold plus train and tube all in this morn 😩❄️ pic.twitter.com/zu1sLt1WMT— Rachael 🎬🎮 (@TheBendySlow) December 5, 2016
Upper Street Islington. Water main. pic.twitter.com/J4kWkgHHQ3— happytobewired (@happytobewired) December 5, 2016
Bit of a flood in upper street Islington pic.twitter.com/RCwMyr2PSl— Michael Moseley (@mike_moseley) December 5, 2016