National Express said: "An empty National Express vehicle caught fire at Gatwick Airport earlier this afternoon. We are working closely with the emergency services and will continue to assist them.
"We will also carry out our own thorough investigation to establish the cause of this highly unusual incident."
More top news
Friday morning's forecast for the east of the region
Friday morning's forecast for the west of the region
Detectives have charged two men with the murder of Jason Martin-Smith in Hastings in 2001.