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In Australia, two police officers and a citizen were shot dead in a rural property west of Brisbane, ABC television reported.
Another officer suffered a gunshot wound and is being treated in hospital, Queensland Police Commissioner Katarina Carroll said.
A fourth employee was able to escape the property and is also receiving medical attention.
The attackers are still at large.
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"There is currently an operation on site, as I said, this evening involving PolAir and specialist colleagues," Commissioner Carroll said.
The property where the shooting took place is set among small blocks of land and has a small wooden house.