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."
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At least two intruders broke into the property and shot Mr Hedger in the early hours of Sunday morning.
Sunday evening's weather for the east
Sunday evening's weather for the west