A fire investigation has been launched after a huge blaze ripped through an electricity substation in Harlesden on Christmas day.
The London Fire Brigade was called to the National Grid site in Acton Road, Harlesden, when more than 120,000 litres of transformer oil went up in flames.
And crews were still making the substation safe on Monday as they let the intense fire burn iteslf out.
Around 30 fire fighters and six engines were called to the emergency just before 1am on Christmas morning and battled with the ferocious flames for more than 10 hours before they were finally under control.
The blaze was sprayed with a foam blanket to stop it spreading and causing further damage to the surrounding industrial estate.
A fire brigade spokesman said: "The situation is ongoing and we still have crews down on the site as there are some small pockets of fire remaining.
"The substation was badly damaged by the fire but no one was injured."
National Grid have confirmed that power supplies were not effected and there were no evacuations of the area.
Isobel Rowley, spokeswoman for the electricity supplier, said: "We are working with London Fire Brigade during the aftermath the a fire. Smoke is still being generated on the site and a Òburn outÓ process has been recommended by firefighters to make sure it does not reignite. The substation has been made electrically safe."
It is not known what caused the explosion.