Emergency services are tackling a fire at a gas conversion garage in Darlington.
There are also reports of explosion at the building on Cleveland industrial estate in the Albert Hill area.
The air ambulance is taking one casualty to Newcastle's RVI.
He's believed to have arm and head injuries.
More top news
Celebrations have been taking place in County Durham to honour 100 years of the Women's Institute.
Kerrie Gosney brings you Sunday night's forecast
Mild but moist air moving in from the southwest over the next few days. Rather cloudy, with the risk of rain