All roads have now been re-opened again following a large fire in a construction site in Durham City on Wednesday (15 September) afternoon.
Fire crews were called the Milburngate development area just after 2pm - with some staying at the scene overnight.
Our reporter Emily Reader was live in Durham on 15 September.
Two people have been treated for smoke inhalation.
Area manager Keith Wanley, Durham and Darlington Fire and Rescue Service, said: "On arrival, we found that there was a fire in a cavity wall that runs along the outside of the development.
"The fire is only in the cavity wall. We have got jets of water into the cavity wall to control the fire."
The fire service dismissed rumours there had been an explosion. Mr Wanley explained that the "smoke swelling up as the wind changes direction" may have given that impression.
In a social media post, Durham and Darlington Fire & Rescue Service said: "8 crews are at the scene of a fire at the Milburngate development.
"We would like to confirm there are no reports of an explosion & we are dealing with large fire in the construction site. Please avoid the area & find an alternative route home."
The North East Ambulance Service said: "We were called at 2.09pm to reports of a fire at the Milburngate development in Durham city centre."We have dispatched three vehicles from our Hazard Area Response Team and a double crewed ambulance. We are currently still on the scene."
An investigation is continuing into the cause.