This photo was provided by the family of Robert Levinson after they received it in April 2011. (Uncredited/AP)

Robert Levinson, a retired FBI agent who disappeared in Iran more than six years ago, was working for the CIA in what U.S. intelligence officials called a “rogue operation.” His whereabouts are unknown, and investigators can’t even say for sure whether he’s still alive.

From the family of Robert Levinson:

Bob is a courageous man who has dedicated himself, including risking his own life, in service to the U.S. government. But the U.S. government has failed to make saving this good man’s life the priority it should be. There are those in the U.S. government who have done their duty in their efforts to find Bob, but there are those who have not. It is time for the U.S. government to step up and take care of one of its own. After nearly 7 years, our family should not be struggling to get through each day without this wonderful, caring, man that we love so much.