At least four people have been shot dead by a gunman in Darwin, northern Australia, police say, reports BBC.
Eyewitnesses said the gunman entered a motel in an inner suburb of the city and opened fire in a number of rooms before fleeing.
Police responded at about 18:00 local time (08:30 GMT) and arrested the man an hour later.
Australian Prime Minister Scott Morrison said the shooting was not terror-related.
Police said they believed the man had acted alone and they were not looking for any other suspects.
Mass shootings in Australia have been a rare occurrence since the country overhauled its gun laws in 1996, in the wake of a shooting in Tasmania that killed 35 people.
Northern Territory police duty superintendent Lee Morgan confirmed the fatalities, and said two more people had been injured.
The city centre remained in lockdown for an hour after the gunman fled the scene of the shootings, in the suburb of Woolner.
The gunman was reportedly carrying a pump action shotgun, and up to 20 gunshots were heard.
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