Police are yet to formally identify three bodies which were found after a house fire in Canberra’s north that appears to have been deliberately lit.

Forensic officers spent the night at the scene of the house fire in Bonner, after firefighters entered the premises to combat the blaze and located three bodies inside.

“It’s a difficult scene - there's been a fire in there,” Detective Superintendent Scott Moller said.

Thick smoke blanketed the neighbourhood after the house fire at the Bonner home. (9NEWS)

Police have said the investigation into the deadly blaze was a "complex" one.

“The ACT Fire and Rescue have done a terrific job to extinguish the fire and we've found three people deceased ... so it's a horrific scene."

He told media today that the bodies were removed from the building last night and are yet to be formally identified.

He also said initial investigations indicate that the fire was deliberately lit.

Authorities are checking the possibility of multiple points of ignition for the fire.

Fire crews were called to the scene yesterday around 9am to find the home fully engulfed in flames and smoke (Supplied). (Supplied)

"We can say that after our investigation last night that the fires were deliberately lit," the spokesperson said.

"We're investigating all avenues. This investigation is complex - it's going to be a significant investigation and will be ongoing for some times and we'll be following every lead that we can."

While authorities have not yet confirmed the names or ages of the victims, 9NEWS understands they were a mother believed to be aged in her 30s and two primary school-aged children.

Fire crews were called to the house yesterday at 9am, finding the house fully engulfed by flames.

Neighbours of the home say the woman had lived at the property for five years and the two young children sometimes visited.

“One of the ladies ran straight over and tried to knock on the door to see if there was any life,” one neighbour told 9NEWS.

"We couldn't hear anything, couldn't see anyone."

Police have treated the fire as suspicious. (9NEWS)

Another man who lives next to the property also said the proximity of the incident has been hard to come to terms with.

“It’s not a nice thing to know that two doors down, something like that has happened,” he said.

Fire crews were called to the scene yesterday at around 9am, arriving to find the home fully engulfed by flames and thick smoke blanketing the neighbourhood.

The bodies of two children and one adult were found in the smouldering ruins of the home. (9NEWS)

"A structural assessment was completed, police entered the premises and searched the house – during that search, police tragically located three persons who were deceased," ACT Police Detective Superintendent Scott Moller said.

Police were unable to say where in the building the three bodies were located due to the ongoing investigation, confirming authorities are looking at possible accelerants that may have been used and the possibility of multiple “seats of fire” in the house.

They have since removed the bodies from the property and autopsies will be carried out.

A man who was taken into custody yesterday has since been released without charge.