Levinson disappeared on March 9, 2007, while working as a private investigator looking into cigarette smuggling on the Iranian resort island of Kish.
On November 27, his captivity hit 2,455 days, one more than journalist Terry Anderson, who was held by Hezbollah in Lebanon until 1991.
U.S. officials suspect that Iranian intelligence services are holding Levinson. His family last received photos of him in April 2011.
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