![This Image provided by the Federal Bureau of Investigation(FBI) shows a photo of former FBI agent Robert Levinson, who went missing on Kish Island, Iran, on March 9, 2007, shackled and holding a sign. The United States announced a $5 million increased reward March 9, 2015 for information leading to the return of Levinson, as it marked the eighth anniversary of his mysterious disappearance in Iran. The FBI had previously issued a $1 million reward for Levinson's return in 2012, five years after he went missing. AFP PHOTO / HANDOUT / FBI == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO / HANDOUT / FBI "/ NO MARKETING / NO ADVERTISING CAMPAIGNS / NO A LA CARTE SALES / DISTRIBUTED AS A SERVICE TO CLIENTS == (Photo by -- / FBI / AFP)](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/PEXAX24N2A4V2YUMSH5ELR6AVE.jpg?smart=true&auth=a750153725abca9b89ab9f8bbc892ef92b8766c5700aae622c476fcbcbb7d5e3&width=400&height=225)
Former FBI agent Robert Levinson went missing on Kish Island, Iran, on March 9, 2007. AFP
Former FBI agent Robert Levinson went missing on Kish Island, Iran, on March 9, 2007. AFP
US family marks anniversary of longest-serving foreign hostage in Iran
Bob Levinson went missing in 2007 during an investigation to Iran’s Kish Island