Four fire engines and around 20 firefighters and officers were called to a fire on the North Circular Road in Neasden last night.
A stack of tyres, pallets and rubbish was damaged by fire.
The Brigade was called at 2158 and the fire was under control at 0001. Fire crews from Willesden, Park Royal and Wembley fire stations attended the scene.
The cause of the fire is believed to be deliberate ignition.