Nottinghamshire Fire and Rescue Service released the images to show the impatience of fire doors working correctly.
Derek Higton, Nottinghamshire County Council’s Service Director for Place and Communities, said: “We would like to thank Nottinghamshire Fire and Rescue Service for not only its swift response on the day, but also for how it has carried out the subsequent investigation into the fire since it broke out at County Hall on Thursday.
“It is good to know that our fire precaution arrangements and infrastructure worked effectively, with our automatic fire doors functioning correctly to contain the damage at County Hall and to ensure the safety of all those who were in the building at the time.
“Since the fire was extinguished, we have worked well to ensure that any disruption to our services has been minimal and I can confirm that our services are now fully operational.
“It goes without saying that we’d like to thank the public and our staff, who I must stress followed our fire safety regulations correctly and without panic, for their continued patience in this challenging period for us.
“Finally, the response to the emergency by all those who were in the building on Thursday shows the value of having our regular and consistent fire drills.”