A major incident has been declared by firefighters tackling a large moor fire in the North York Moors National Park.
North Yorkshire Fire & Rescue said it has been fighting the blaze on Langdale Moor, close to the RAF Fylingdales early warning station, on Tuesday morning.
On Wednesday afternoon, the service said the fire had spread to cover five square kilometres and 20 pumps were at the scene, with more being sent.
David Skaith, mayor of York and North Yorkshire, and Jo Coles, deputy mayor for policing, fire and crime, said in a statement: "We are aware of North Yorkshire Fire and Rescue Service's declaration of a major incident for the fire at Langdale Moor and continue to monitor the situation.
"We encourage the public to avoid the area and follow the latest advice from the fire service, which can be found on their website.
"We want to thank the firefighters, emergency service workers and partner agencies for their response to this incident."
It comes as heat health alerts have been extended into next week for much of England.
Yellow warnings will now be in place in Yorkshire and Humber, the East and West Midlands, London, the South East and South West and East of England until 6pm on August 18, the UK Health Security Agency said.
Alerts were previously due to end at 6pm on Wednesday as the country experiences its fourth heatwave of the summer.
The warnings mean significant impacts on health and social care services are possible due to high temperatures, including a potential rise in deaths among the elderly or those with pre-existing health conditions.
Heavy rain and thunder hit London and Kent on Wednesday afternoon, and the Met Office said it was likely the South East would continue to experience thick clouds and a risk of heavy thundery showers overnight.
Northern England and Northern Ireland should see isolated afternoon and evening thunderstorms and flood alerts have been issued for Scotland.
