The State Department on Friday told Americans to "leave Iran now," amid nuclear talks between the U.S. and Iran in Oman.

"Leave Iran now," the virtual U.S. embassy to Iran said in a notice. "Have a plan for departing Iran that does not rely on U.S. government help."

"U.S. citizens should expect continued internet outages, plan alternative means of communication, and, if safe to do so, consider departing Iran by land to Armenia" or Turkey, according to the embassy.

It is unclear how many U.S. citizens are currently in Iran, USA Today reported.

The reason for the notice is "Increased security measures, road closures, public transportation disruptions, and internet blockages are ongoing," the embassy said. "The Government of Iran continues to restrict access to mobile, landline, and national internet networks. Airlines continue to limit or cancel flights to and from Iran."

Last month, Iran cracked down on the largest protests that the country had seen in more than 40 years.

On Friday, President Trump's special envoy to the Middle East, Steve Witkoff, and Jared Kushner met with Iranian Foreign Minister Abbas Araqchi. The talks are the first negotiations that the Trump administration has had with Iran since the U.S. bombed three Iranian nuclear facilities in June.

The U.S. has a virtual embassy in Iran because it has not had a physical location in Tehran since the Iranian revolution in 1979, when militants stormed the embassy and held Americans hostage for 444 days.