It's been two years since U.S. citizen Robert Levinson went missing while on a trip to Iran.
Levinson, a retired FBI agent from Florida, was last seen on Iran's Kish Island on March 8, 2007. He was reportedly investigating cigarette smuggling.
Officials in Iran have said they have no information on his whereabouts.
Levinson's wife, Christine, says she believes her husband is still alive.
"Until someone gives concrete evidence of him not being alive, I will always believe he’s alive," she told RFE/RL.
On March 8, the U.S. State Department issued a statement marking the anniversary of Levinson’s disappearance and reiterating its call for Iran to help find him.
"We continue to call on Iran to stand by its commitment by providing full details about their authorities' investigation both to his family and to the Swiss Embassy in Tehran, which looks after U.S. interests in the absence of normal diplomatic relations," the statement said.
U.S. Senator Bill Nelson of Florida said last month
he believes Levinson is alive and "being held by the Iranians."
In an effort to help locate him, his family has released a computer-enhanced photograph showing what Levinson may look like now.
More information on Levinson's case can be found here
.(by Golnaz Esfandiari)