Iran has closed its airspace amid the mounting death toll from anti-government protests, triggering flight chaos across the Middle East and neighbouring regions.
Images from Flightradar24 show no aircraft flying over Iran, with the closure advisory valid for a little over two hours.
Exceptions may be made for select international flights into or out of Iran that have been granted permission from Iran's Civil Aviation Organisation.
READ MORE: 'Tripwires' passed - is this the fall of the Islamic Republic in Iran?
Live tracking data from the Flightradar24 website show flights hugging Iran's borders to avoid the nation's airspace.
Some international airlines have also reported plans to avoid Iranian airspace for the time being.
Air India is rerouting flights over the region to keep passengers safe.
It said in a post on X that "alternative routes" may cause delays and, where rerouting wasn't possible, cancellations.
Lufthansa, a German Airline, announced plans to avoid Iranian and Iraqi airspace "due to the current situation in the Middle East" shortly before Iran closed its airspace today.
Agence France-Presse reported Lufthansa would bypass the airspace "until further notice".
Some US military personnel have also been evacuated from a base in nearby Qatar as concerns grow that President Donald Trump's administration could launch military action against Iran.
Smartraveller.gov.au, the Australian Government's official travel resource, urged Australians to leave Iran on Monday while it was still possible.
Those who choose to remain against government advice have been told they are responsible for their own safety.
The death toll from ongoing protests is estimated to be in the thousands.
"Security forces' response to protests has been severe, and many protesters and bystanders have been injured, killed or detained," the latest advice read.
"Australians, including dual nationals, are at a high risk of being detained."
The Australian embassy's operations in Iran have been are suspended and its ability to provide consular assistance is extremely limited.
US-based Human Rights Activists News Agency has reported that more than 2600 people have been killed in the ongoing protests.
However, information coming out of Iran is difficult to independently verify due to government media censorship and telecommunications blackouts.
DOWNLOAD THE 9NEWS APP: Stay across all the latest in breaking news, sport, politics and the weather via our news app and get notifications sent straight to your smartphone. Available on the Apple App Store and Google Play.