BBC News
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image captionFirefighters worked in challenging conditions on the mountainside in County Down
A blaze in the Mourne Mountains was "probably a deliberate fire", according to a senior officer in the NI Fire and Rescue Service.
Significant progress has been made to control the major fire on Northern Ireland's highest mountain.
On Sunday the Slieve Donard blaze was brought under control and the operation scaled down after three days.
Area Commander Mark Smyth said that if the fire was deliberate, it made him "angry".
"Whilst a fire that starts at 23:00/00:00 BST comes to our attention halfway up a mountain it's hard for me to say here today that that was accidental," he told the BBC's Good Morning Ulster programme on Monday.