The vans were at the rear of a derelict office block and were completely destroyed.
Two single-storey units and a small part of the building’s facade were also damaged. One man was treated for burns and taken to hospital.
Station Commander Mick Palmer, who was at the scene, said: “There was a lot of heavy smoke which prompted 32 calls to the 999 control officers.
“Due to the smoke, residents were advised to shut their doors and windows.”
The brigade received the first call to the fire at 6.24pm. Crews from Park Royal, Wembley, Acton, Ealing and Willesden attended. The fire was under control by 7.37
The cause is not yet known.
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