Detective Superintendent Scott Moller confirmed that "multiple adults and some children" were at home in the two-storey home on Harrington Circuit in Kambah when three bullets were fired into the property about 1.30am on Monday.

The bullets struck the garage door of the house.

Superintendent Moller also confirmed accelerant was poured on three vehicles outside the home and all three set on fire in the attack.

Neighbours have described hearing three "pops", along with the sound of a car leaving the scene.

Briana Zaffina, who lives next door to the house with her partner and seven-month-old son Remi, said she heard what she thought sounded like gunshots between 1.15 and 1.20am.

"I've never heard gunshots in my life so I don't know specifically what they sound like. But in my mind, for some reason I thought they were gunshots straight away," she said.

Ms Zaffina said she saw a flash in the driveway of her neighbours' home and then heard a car drive down the street.

The neighbours were trying to put out the spot fires on their car bonnets, parked on the nature street at the front of the house, she said.

"It was almost like a car back firing but not. I would have assumed gun shots to be a bit louder, a bit more extreme."

Ms Zaffina said her neighbours were a big family, had lots of kids and generally stayed to themselves.

A person who was staying in the house next to where the incident happened said he heard what sounded like a V8 engine backfire three times sometime after midnight.

The man, who declined to give his name, said he heard the car leave slowly.

"This is a bloody quiet street," he said.

The Canberra Times understands police found .45 calibre automatic cartridges at the scene.

The Kambah shooting comes a week after the arrest of a 30-year-old man, whom police identified as the ACT president of a new bikie gang in Canberra, the Satudarah. The man was charged with several violent offences, including grievous bodily harm, on a victim at a home in Oaks Estate.

Last year bikie gangs were responsible for multiple drive-by shootings and targeted attacks across Canberra, including one on a Calwell residence in which bullets were fired into the home and cars set alight.

Superintendent Moller would not speculate on whether the Oaks Estate incident and this recent shooting and arson attack were linked or a reprisal attack, but gave strong indications that the "patching over" of members from one club to another could be a motive for increased tension between bikie gangs.

"The outlaw motorcycle gang world is fluid and people move between clubs quite frequently, so we are going to get this interaction quite often," he said.

"The establishment of any club in any jurisdiction . . . brings more violence to the town they are in.

"So any new club coming into town will have an impact on the other clubs."

Police confirmed that people living in the home had "connections" to outlaw motorcycle gangs.

Taskforce Nemesis, the police specialist team dedicated to investigating bikie gangs in Canberra, was increased in size last year after the spate of attacks. It now includes separate proactive and reactive teams, and intelligence-gathering.