A gunman shot dead four people and injured another at five different locations in the northern Australian city of Darwin, officials said.
The 45-year-old suspect, who was known to the police, was arrested an hour after the first shots were reported at about 18:00 local time (08:30 GMT).
Police said they believed the man had acted alone. The crime scenes reportedly included a motel and a bar.
Prime Minister Scott Morrison said the shooting was not terror-related.
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The alleged gunman, who had been on parole since January, was wearing an electronic tag, Northern Territory Police Commissioner Reece Kershaw said.
"We're still trying to establish the intent and motivation behind this," he told journalists.
The gunman was reportedly carrying a pump action shotgun, and up to 20 gunshots were heard.