An investigation has started after fire destroyed 19 vehicles, damaged four others and a workshop at Upper Beeding, West Sussex, on Sunday (24 September).
Four O-Licenced operators use the site near Brighton: Ace Travel (Sussex), Brighton Travel, Southern Transit and City of Chichester Coaches.
Firefighters were called at 0230hrs, and six fire engines were sent to tackle the blaze, which also destroyed two portable buildings and the workshop, before it was put out at 0530hrs.
Photographs appeared to show that the fire started in at least two separate locations on the site.