The Fire Service has said there is no risk to property or life after a blaze broke out on Belfast's Cave Hill on Wednesday evening.
Residents had voiced concern for their homes.
Fire crews are in attendance and will continue to monitor the blaze through the night.
Clouds of smoke have been billowing across the city after the blaze erupted in the early evening.
It has been seen as far off as Saintfield.
The Fire Service told UTV the location was difficult to get to.
It has dispatched two crews to the scene and the public been urged to stay away and close windows.
In an update, it said in a statement: "[We] remain in attendance at a gorse fire at Cave Hill.
"There is no risk to life or property, and fire crews will remain on scene throughout the night to closely monitor and assess the incident.
"Please avoid the area and keep windows closed as a precaution."