Braine Street was locked down after an expansive, blood-soaked crime scene was established on Saturday, as police continue to investigate the incident.

Officers went to the neighbourhood about 9am, after reports of a disturbance. Multiple locations were cordoned off after police arrived to find the man's body, two injured men and an injured woman.

They found a seriously injured man and provided initial treatment.

While police were providing emergency first aid to the injured man, they say another man rushed at the officers. Officers tasered him and took him into custody.

Inside the house, police found a deceased man, as well as a woman who had "significant injuries".

The two men and the woman were all taken to Canberra Hospital. One of the men and the woman have undergone surgery.

Police are expected to reveal on Sunday what sparked the violence and what type of weapon or weapons may have been involved.

Detective Superintendent Scott Moler told reporters on Saturday the task of processing the crime scenes was likely to take some time.

"This incident stretched over a number of properties," he said.

Asked about the pair in surgery, he said: "They are in a very serious condition."

Supt Moller said on Saturday there was "no ongoing risk to the public" and it was not yet clear exactly what happened. "We're still working through all the issues in relation to the incident. We're still piecing together the circumstances.

"I believe we'll probably be here throughout the night and into tomorrow before we are really able to process all of the evidence at the scene."

No ages have been provided by police for the deceased, nor the injured.

The suspected assailant is also understood to have significant wounds, and was also undergoing treatment on Saturday. His condition, too, remains unknown, and a police guard was established for him at the hospital.

A major crime scene was erected on Braine Street, with portable screens encompassing not just the address where the incident occurred, but four neighbouring homes.

While the house where the deceased man was found is the primary crime scene, the extent of the police cordon indicates there are several secondary crime scenes.

Police confirmed the crime scene stretched over a number of properties, possibly as a result of one of the victims attempting to flee the house and seek help from a neighbour.

There is also a strong indication that the weapon, or weapons, involved came from within the house where the deceased man was found. No firearms were used.

Police said full investigative resources had been deployed, including all available forensics crime scene staff.

A 360-degree crime scene mapping camera has been set up to capture three-dimensional imagery of the location.

Detective Superintendent Scott Moller would not be drawn on whether this was a family violence incident.

"We're still working through all the issues in relation to this ... and piecing together the circumstances," he said.

Superintendent Moller would not discuss what weapons were involved, whether or not the people involved were known to each other, nor whether the Braine Street address was known to police.