Prosecutors have accused a former US Air Force officer of spying for Iran in an elaborate operation that targeted her fellow intelligence officers.
Monica Witt, who defected to Iran in 2013, had previously worked as a US counterintelligence officer.
Four Iranian citizens have also been charged with attempting to install spy software on computers belonging to Ms Witt's colleagues.
According to the FBI, Witt was last seen in southwest Asia in July 2013.
Witt had been granted the highest level of US security clearance and worked in the US Air Force from 1997 to 2008.
The US Department of Treasury has also sanctioned two Iranian companies - New Horizon Organization and Net Peygard Samavat Company - for their role in the plot.
https://www.bbc.com/news/world-us-canada-47231777