Americans are being urged to show extra vigilance with their personal safety in Australia given a terrorist attack is "likely".
Melbourne gets a special mention in the US embassy warning, which follows recent counter-terrorism raids that have landed young men in court charged over terror plots, one allegedly an Islamic State-inspired attack.
The US embassy does not refer to any particular raid, but says one arrested person "had the intent to conduct terrorist attacks against members of the general public".
"US citizens are strongly encouraged to review your personal security plan, remain aware of your surroundings including local events, and monitor local news stations for updates," the US warning says.
Australia's terror alert level remains high meaning a "terrorist attack is likely", it says.
So US citizens are asked to register their names for ongoing rapid updates.
In March, Melbourne teenager Jake Bilardi staged a suicide car bombing in Iraq, and in April, former male model Sharky Jama was shot dead in Syria.
In Melbourne an alleged plot to stage a beheading on ANZAC Day was foiled in April when police charged three men, who are now before the courts facing different offences.
In May, a Melbourne teen was charged just before Mother's Day over an alleged "imminent" bomb attack.
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