Massive blaze engulfs a block of flats in London. Picture: Twitter

LONDON: Firefighters are battling a massive fire in an apartment high-rise in London on Wednesday.

One side of the building -- Grenfell Tower-- in West London appeared to be in flames. 

Forty fire engines and 200 firefighters were called to the scene early Wednesday morning.

Forty fire engines and 200 firefighters are battling the blaze. Photo: Twitter

Two people were being treated at the scene for smoke inhalation and cordons were in place, the Metropolitan Police said. 

?Amazing Spaces? presenter George Clarke told Radio 5 Live he was covered in ash even though he was 100 meters (yards) from the scene, Associated Press reported.

He said he saw people waving flashlights from the top level of the building and saw rescuers ?doing an incredible job? trying to get people out.