The huge warehouse blaze which took 60 firefighters to get under control has been ruled accidental.
Group manager at Bucks Fire and Rescue, Steve Wells, said: “When the fire investigation report has been completed, it will be shared with the company and its insurers.
“However, one thing we can confirm at this stage is that the evidence we have gathered clearly shows the cause was accidental.”
Huge plumes of thick, black smoke could be seen for miles around after the fire broke out at the Liebherr warehouse in Renny Park Road just before 2pm on Wednesday.
Fire crews from as far as Dunstable and Aylesbury were called in to get the fire under control.