Firefighters were called to a serious fire house in Derby after residents claimed they heard an “explosion”.
Derbyshire Police and the Derbyshire Fire and Rescue Service were called to Brighton Road in Alvaston just after 10pm (Saturday).
A spokesman for the Derbyshire Fire and Rescue Service said the fire was “serious” and the circumstances behind it were being investigated.
It is not yet known whether any of the victims were injured by the fire.
Firefighters were at the scene for about two hours after being called by the police.
Residents told Derbyshire Live they could hear an explosion that prompted emergency services to crowd the street, which is on London Road.
A spokesman for the Derbyshire Fire and Rescue Service said: “We were mobilized to the incident at 10:02 p.m., three firefighters were present including Nottingham Road, Long Eaton and Kingsway.
“The cause of the fire is being investigated and we will be out again this morning.
“Four breathing apparatus and a jet hose reel were used to extinguish the fire.”
One resident told Derbyshire Live: “At around 10pm yesterday, Brighton Road was closed with about eight or nine emergency vehicles including fire engines, police cars and emergency response cars. It looked like a serious incident.
“There’s still a police car parked outside at 7 this morning.”
Another resident said: “I just saw the commotion on Commerce Street outside London Street and the kids said it was a house explosion.”
Derbyshire Live has contacted the Derbyshire police for more information. At this stage the officers can only confirm that there is a house fire.