Four fire engines and around 25 firefighters tackled a shed fire on Lee Road in Perivale.
A shed was destroyed by the fire. There are no reports of any injuries.
A propane cylinder was removed as a precaution and cooled to an ambient temperature, as some cylinders can explode when exposed to heat.
Control Officers took the first of 15 calls at 0642 and mobilised crews from Wembley, Park Royal and Northolt fire stations to the scene. The fire was extinguished by 0732.
The fire is believed to have been accidental and was caused by gas leaking from a cylinder.