More than 1,000 Amazon workers at the online delivery giant's Midland warehouse were evacuated on Sunday as a fire ripped through the depot.
Around 1,100 employees were ordered out of the firm's massive Rugeley base as a blaze tore through the first and second floors just after 2am.
Up to 20 firefighters were at the scene throughout the night and Staffordshire Police officers were also there.
The cause of the blaze was being investigated by detectives and scenes of crime officers from the force were also involved.
It is understood the fire will have no impact on Christmas deliveries.
It has also emerged there was a small fire at the same depot last Wednesday, the cause of which is also being investigated.