Any Australians planning to travel to the UK are advised to exercise a "high degree of caution" following the Manchester attack, which have left 22 people dead and scores injured.
The Department of Foreign Affairs and Trade updated its travel advice, issuing a warning for Australians to be "vigilant with their own personal security, be aware of suspicious behaviour, follow the instructions of local authorities and to regularly monitor the media".
The Australian advice follows moves by the UK government to increase its domestic threat to "critical" - this is the highest of the four domestic threat levels.
The British government has also announced armed soldiers will be deployed around the cities to help police monitor security.
People are advised to avoid the area around Manchester Arena and to expect increased police and security presence across the nation.
"Exercise a high degree of caution in the UK due to the threat of terrorist attack. Use common sense. Look out for suspicious behaviour, as you would in Australia. Monitor the media and other sources for changes to local travelling conditions."