Nour Ahmad Nikbakht

Iranian diplomat Nour Ahmad Nikbakht, abducted in Yemen in 2013, embraces his daughters at Mehrabad airport after being freed and returning home, in Tehran, Iran, Thursday, March 5, 2015. Iran said Thursday that a team of special operatives has freed the Iranian diplomat abducted more than 19 months ago in Yemen, a rare acknowledgment by Tehran of an intel operation carried out on foreign soil. (AP Photo/ISNA, Amir Pourmand)

Iranian diplomat Nour Ahmad Nikbakht, abducted in Yemen in 2013, embraces his daughters at Mehrabad airport after being freed and returning home, in Tehran, Iran, Thursday, March 5, 2015. Iran said Thursday that a team of special operatives has freed the Iranian diplomat abducted more than 19 months ago in Yemen, a rare acknowledgment by Tehran of an intel operation carried out on foreign soil. (AP Photo/ISNA, Amir Pourmand)