Another country has urged its citizens to leave Iran "as soon as possible"

The Serbian Ministry of Foreign Affairs has urged citizens of the republic who are in Iran to leave the country.

"Due to rising tensions and the risk of deteriorating security situation, all citizens of the Republic of Serbia who are in the Islamic Republic of Iran are advised to leave the country as soon as possible," the Foreign Ministry statement said.

Earlier, Polish Prime Minister Donald Tusk urged the country's citizens to immediately leave Iran, warning that this may soon become impossible.

American authorities have issued a similar appeal to their citizens.