When Washington tells citizens to leave immediately, it usually means the threat picture just turned ugly.
Iran
Review the latest State Department Travel Advisory about Iran. Do not travel to Iran for any reason. U.S. citizens in Iran should leave immediately. U.S. citizens are at risk due to terrorism, civil unrest, kidnapping, arbitrary detention of U.S. citizens, torture, and wrongful detention.
https://travel.state.gov/en/international-travel/travel-advisories/iran.html
Still current at:08 January 2026
Updated:07 January 2026
Latest update:Do not travel to Iran. If you’re in Iran, you should leave as soon as possible. There’s ongoing violent nationwide protests that may further escalate without notice. Security forces’ response to protests has been severe, and many protesters and bystanders have been injured, killed or detained. Avoid large public gatherings, demonstrations and protests and follow the advice of local authorities. Australians, including dual nationals, are at a high risk of being detained. The security situation is volatile. If you remain in Iran despite our advice, you’re responsible for your own safety. The Australian Embassy’s operations are suspended. Our ability to provide consular assistance in Iran is extremely limited.
https://www.smartraveller.gov.au/destinations/middle-east/iran