The thick black smoke could be seen for miles around

The huge blaze at the VDC House, a CD and DVD manufacturer in north London, also stopped work on the new Wembley Stadium nearby.

Some firefighters are still there cooling down gas cylinders.

At its height on Thursday afternoon, 150 firefighters were at the scene. No-one was hurt but Chiltern Rail services are still affected.

Fire crews were called to the building in South Way just before 1200 BST on Thursday.

Firefighters injured

A London Fire Brigade (LFB) spokesperson said half of the ground floor and first floor of the factory were alight.

The spokesman said two firefighters had been taken to the Central Middlesex Hospital with minor injuries, which a brigade spokesman later said were related to the hot weather.

Clouds of smoke were viewed across London's skyline, with people working as far away as the City saying they could see it.

Three Valleys Water said they called customers in the area asking them to limit their water use to help the firefighters.

The company said it estimated LFB used 17 million litres of water which may have caused some properties to lose pressure or their supply for a while.

People living in the area were also asked to limit their water use over the weekend to help supplies return to normal.

The Chiltern rail line is affected and there is no service between Marylebone and West Ruislip.