Firefighters have been battling a blaze in a bus at an industrial estate in Poling, near Arundel.
Two people have been treated for smoke inhalation but do not require any further medical attention, West Sussex Fire and Rescue Service said.
Two crews were sent to the scene, close to the A27, at around 5.40pm today, Monday May 11.
An hour later the fire was reported to be out, though officers are still there.
It is currently not know how the fire started.