Four fire engines and around 25 firefighters were called to a fire at an electrical substation in New City Road in Plaistow.
A single storey electrical substation was destroyed by fire. Firefighters prevented the fire from spreading to an adjacent primary school and classroom building. Neither building sustained any fire damage.
The Brigade was called at 2204 and the fire was under control at 0051. Fire crews from East Ham, Plaistow, Stratford and Poplar fire stations attended the scene.
The cause of the fire is believed to be accidental and due to a failure within a transformer in the substation.