Fighting militancy: Australia passes anti-terror citizenship law
A police spokesperson said an operation was going on but could not provide any details. The Twitter account of the city's ferry service said one ferry service had been cancelled due to the operation.
Australia is on heightened alert for attacks by home-grown militants. Authorities say they have thwarted a number of potential attacks, although there have been several "lone wolf" assaults.
Australia detains seven men suspected of trying to join militants
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