Six fire engines and around 40 firefighters have been at the scene of a fire at a waste collection site on Weir Road in Wimbledon.
A large pile of building waste was alight in a single-storey building. The fire was brought under control in around nine hours but it required a significant amount of time for firefighters to fully extinguish the fire.
Local residents were advised to continue to keep their windows and doors closed due to the amount of smoke the fire was producing. Smoke has now subsided and the advice is no longer in place.
Borough Commander for Merton, Steven Vydelingum, said: "We have had firefighters at the scene for four days and working through the nights to extinguish this complex fire.
"There were multiple deep-seated pockets of fires situated within around 6,000 cubic metres of waste. Crews continuously turned over the waste and dampened it down whilst also working closely with the site operators to remove it to a separate site. This enabled firefighters to reach all of the hotspots.
"The transfer of waste was completed yesterday (11 September) and the fire was fully extinguished later in the day.
"Whilst firefighting efforts were ongoing, smoke continued to be produced from the site. We requested that residents living in the surrounding area, which includes in the boroughs of Wandsworth and Merton, and particularly around the Garratt Lane area, keep their windows and doors shut where possible.
"Our scientific advisor was monitoring air quality in the area and we liaised closely with our multi-agency partners including Wandsworth Council, Merton Council, the UK Health Security Agency and the Environment Agency, which supported with further messaging for local residents.
"We know the fire has had a significant impact on local communities. Firefighters have been out in the local area speaking to residents and providing support and advice. They will also be available to carry out home fire safety visits.
"The fire is now out but people can expect to see a Brigade presence today as firefighters check there are no further hotspots."
The Brigade's 999 Control centre received more than 120 calls alerting them to the fire since it broke out.
The Brigade was called at 2226 (on Saturday, 7 September) and the fire was under control by 0734 (Sunday, 8 September). Firefighters from across south London have been in attendance.
The cause of the fire has been recorded as undetermined.