'Terrible Act Of Violence': Accused Killer In Custody

A Darwin man who was well-known to police has been taken into custody, accused of killing four people during a shooting rampage across the city.

The incident began just before 6pm on Tuesday night following reports of a man firing a sawn-off pump action shotgun at the Palms Motel in Woolner.

NT Chief Minister Michael Gunner confirmed four men died in the shooting and one woman has been taken to the Royal Darwin Hospital with gunshot wounds.

Police cordoned off Palms Motel in Darwin. Photo: AAP Image/Michael Franchi.

The injured women is in a stable condition, a Northern Territory Health spokeswoman told 10 daily.

A 45-year-old Caucasian male was arrested by heavily armed and camouflaged police after being on the run for around an hour.

He is being held at Royal Darwin Hospital.

The man, who is well-known to police, was released on parole around January, Police Commissioner Reece Kershaw said.

"He is an individual who is well known to police and has a number of interactions, adverse, with the police force," Kershaw told reporters on Tuesday night.

In a supplied screen grab. Members of the Territory Response Group (TRG) arrest a suspected gunman in Darwin. Photo: AAP Image/Supplied by ABC News.

"So he is well known to us."

It is believed he was wearing an electronic monitoring bracelet at the time.

Parts of the city were thrown into lockdown and road blocks put in place as officers searched for the alleged gunman, described as "armed and dangerous".

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The man allegedly began his rampage at the Palms Motel on McMinn St.

According to witness reports, the shooter "calmly" opened fire at the hotel.

Police at a crime scene on the intersection of McMinn Street and Stuart Highway in Darwin. Photo: AAP.

"He shot up all the rooms and he went to every room looking for somebody and he shot them all up, then we saw him rush out, jump into his Toyota pick-up, and rush off," Witness John Rose told the ABC.

A second witness, Leah Potter, told the ABC she was in the Palms Motel carpark when she heard loud bangs -- she thought they were fireworks.

"Then a man came running with a woman in his arms from next door which is the Palms Motel, which is the motel next to my motel, and he just dropped her on the footpath right in front of us," Potter said.

"I ran and got some towels and wrapped up her legs, she had little holes all in her skin on both her legs and she was bleeding everywhere."

The alleged shooter then reportedly fled the Palms Motel scene in a white dual-cab ute before driving to the suburb of Stuart Park.

Kershaw said there were at least five different crime scenes established, including The Palms Motel, Gardens Crescent Road, a Coles Express petrol station on Daly St, Jolly Strett in Woolner, and the Buff Club in Stuart Park.

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A crime scene has been declared at the Peter McAulay Centre police station -- the NT Police headquarters in the outer Darwin suburb of Berrimah -- after the man allegedly tried to gain entry to the building.

Kershaw said the deceased were found at The Palms Motel, the Buff Club, Gardens Crescent Road and Jolly Street.

Darwin Shooting Map
The shooting locations. Photo: Google Images.

 Around 100 officers are currently working through the crime scenes and stationed across the city to ensure public safety.

Police believe the shooter acted alone and do not suspect the attack was terror-related.

"I understand when an event like this occurs, especially considering recent global events, people's fear turns to terrorism," Chief Minister Michael Gunner said.

"I can confirm that we do not believe this is a terrorism incident."

Darwin Shooting
Chief Minister Michael Gunner (left) and Police Commissioner Reece Kershaw (right) Photo: AAP.

Gunner thanked Territory police and first responders on this "incredibly difficult night".

"This is not the Darwin we know," he said.

"This may be an event you prepare for but this is never an event you want to respond to."

Scott Morrison, who is currently in London, has been made aware of the attack.

"This is a terrible act of violence that is already, I have been advised, taken the lives of four people," the prime minister said.

"I extend my deep condolences and sympathies to all the people of the territory, particularly in Darwin."