Firefighters are battling a wildfire near Land's End Airport that has sent thick plumes of smoke into the sky.
The blaze in the St Buryan area ignited at about 12:20 BST, Cornwall Fire and Rescue Service said. A spokesperson for the airport said it was temporarily closed and "passengers and employees are being moved away from the site".
Sarah Torr, who is nearby with husband Simon, said: "To start with we could just see smoke. Now we can see a wall of fire." She described a cloud of black smoke about 300-400m wide "hanging over west Cornwall".
Another man said National Trust workers were rounding up semi-wild grazing horses in the area to get them to safety.
Cornwall Fire and Rescue Service said initial crews requested further help on arriving in the hamlet of Crows-An-Wra. It said: "In total four appliances are currently in attendance/on their way to this incident."
Cornwall Council said on Facebook there was "a lot of smoke" and urged people to avoid the area and keep windows and doors closed.
A spokesperson for Land's End Airport said: "We are aware of a fire near Land's End Airport, being managed by emergency services. As a precaution, the airport is temporarily closed and passengers and employees are being moved away from the site."
Residents across Devon and Cornwall are being urged to avoid carrying out controlled burns after a number of other fires in the last 24 hours.
On Tuesday, fire crews tackled two separate wildfires in Cornwall, one at Mawgan Porth and the Porth area of Newquay, with residents urged to keep doors and windows closed because of a smoke plume. Cornwall Fire and Rescue Service also said a wildfire in Carnmarth, near Lanner, had four appliances sent to tackle it.
Firefighters in Devon also tackled a grassland blaze in Mincinglake Valley Park that caused several people to flee their homes. Officials said on Wednesday morning that crews were still "on scene monitoring and dampening down hot spots".
At the Carnmarth blaze, firefighters said smoke was visible in the vicinity of the area, including Lanner and Redruth, and asked people travelling through the area to take care. A large fire was also reported at Advent, Camelford, at about 00:00 on Wednesday.
Devon Wildlife Trust said the fire at Mincinglake Valley Park had been devastating and that it would take "a number of years" for wildlife to recover. Land manager Matt Boydell said: "The elements of the grassland and some of the scrub has been lost, but those are the elements that do come back quicker. Luckily, from a very quick look, it looks as though some of the sort of larger trees haven't had too much damage, which is a real relief because, obviously, those are the elements that take decades to return."
Firefighters Battle Wildfire Near Land’s End Airport