Police believe a man used at least two knives in an attack in Page which left one man dead and others seriously injured.
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A specialist taskforce will investigate the circumstances that led to the death of a 34-year-old man during an incident in Page on Saturday.
The taskforce will be made up of a range of specialised investigators, which ACT Policing said had a wide range of expertise including homicide.
A 36-year-old man, who was injured in the bloody incident, has been arrested by police, but no charges have been laid.
Forensics teams remain at the scene on Braine St, Page. ACT Policing Detective Superintendent Scott Moller expected they would remain until Tuesday, going through a large amount of material.
He said police were still working through the exact circumstances of the "unusual" incident which occurred around 9am Saturday.
"Emergency services and police turned up at a scene that was unpredictable and extremely dangerous," Detective Superintendent Moller told media on Monday.
Detective Superintendent Moller said an armed man confronted officers but was tasered and disarmed by police and later taken to hospital.
A 20-year-old woman, along with a 28-year-old man and the 36-year-old man who had been arrested, remain in hospital. They have all undergone surgery and are expected to survive.
He said all the victims suffered "significant" stab wounds from an "edged weapon" police believe was used in the attack.
"We have arrested the man we believe was responsible for this incident, but due to the nature of his injuries and the injuries incurred by the two surviving victims, it will be some time before we are able to speak further to them," he said.
"The primary concern at the moment is the recovery of all the people injured and the investigation will progress once more information is available."
Detective Superintendent Moller said the four people involved were known to each other but would not disclose their relationship to one another. He said they did not all live at the Braine St address.
The man arrested was not previously known to police.
He said the 28-year-old man left the house where the incident occurred and ran onto the street and into other houses nearby.
"It was a terrible scene. There was a lot of blood and for the responding police and paramedics, it was terrible," Detective Superintendent Moller said.
"Everybody in the community is traumatised by it. it's a tragic situation."
It is believed two knives were allegedly used in the initial attack.
Braine Street in Page, where the incident allegedly took place, remains a crime scene two days later.
Detectives have interviewed more than 20 witnesses.
ACT Policing said a search warrant had been carried out at the home of where the victim was found.
Anyone who may have any information that has not yet spoken to police is asked to contact Crime Stoppers on 1800 333 000, or via the Crime Stoppers ACT website. Please quote reference 6737571. Information can be provided anonymously.
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