A man was killed and two others were injured in a shooting incident at an industrial site in Sydney, police said on Monday.
The police had surrounded the attacked industry with an armed gunman still inside, Xinhua news agency reported.
A person was arrested in relation with the incident, said police commander Mark Brett.
"The deceased is 43 years old. Two men with gunshot wounds have been transferred to Liverpool Hospital," Brett said.
"One is undergoing emergency surgery, the other has superficial wounds to the lower part of his body," he added.
The police did not say whether the gunman had any hostages.
"It's at a delicate stage. I really can't give you any more information," Brett said.
Emergency services were called to the site around 10.45 a.m. (local time) on Monday.
Five gun shots were heard in the area, according to nearby people. An employee at a nearby business said one person was dead.
"Police told us not to go near windows," the employee said.
Australians are still on alert since a lone gunman took 17 hostages at a cafe in Sydney in December 2014.
Two hostages were killed along with the gunman during the 16-hour stand-off.
