A man is in hospital following a "serious" house fire thought to have been caused by a gas explosion.
Emergency services responded to the incident in Wordsworth Road, Darlington on Monday evening following reports of a "loud explosion".
Pictures posted to social media by County Durham & Darlington Fire & Rescue Service show a damaged semi-detached house with some of the window panes removed.
Durham police said on Twitter: "A loud explosion may have been heard in Darlington.
"Officers are currently in attendance of what is thought to be a gas explosion at a property on Wordsworth Road.
"Police, fire and ambulance personnel are all at the scene.
"One man has been taken to hospital."
The fire service said: "Fire crews from Darlington and Newton Aycliffe tackle a serious house fire in Darlington this evening.
"The exact cause is currently under investigation."