This is reported by AFP.

#BREAKING US charges former Air Force intel for engineer with spying for Iran pic.twitter.com/5vhfm4dYn0

- AFP news agency (@AFP) February 13, 2019

In April 2018, Iranian Foreign Minister Mohammad Javad Zarif told why there are difficulties in the negotiation process with the United States over the American citizens detained in Tehran on charges of espionage or attempted espionage.