One of the five photos of missing FBI agent Robert Levinson. His family released the pictures on Tuesday.
Credit: Screengrab

The United States government has asked Iran for help locating former FBI agent Robert Levinson, who disappeared in Iran in 2007 and is now the longest-held US hostage in a foreign country.

As of Tuesday, Levinson has been in captivity for 2,454 days, longer than Associated Press bureau chief Terry Anderson, who was held hostage in Beirut from 1985 to 1991.

Levinson’s family received a video of him in 2010 and photos of him from a Pakistani IP address in 2011, but his location and the identity of his captors are not known.

More from GlobalPost: Photos of missing FBI agent Robert Levinson surface

An Iranian government spokesman told NBC News that Iran does not know where Levinson is. “Iran has had maximum cooperation with Mr. Levinson's family and his family had a trip to Iran,” Alireza Miryousefi, counselor to Iran’s mission to the United Nations, told NBC News. “Iranian organizations had worked with his family to find out where is Mr. Levinson. We are interested too to find out why Mr. Levinson was in Kish.”

The US has also requested the return of two US citizens known to be detained in Iran – Saeed Abedini, a US pastor from Boise, Idaho, and Amir Hekmati, a former US marine.

“The US government has made a respectful request of the Iranian regime during this holiday season to consider on humanitarian grounds releasing these three Americans, or at least releasing the two Americans we know are detained and locating the whereabouts of the third, Mr. Levinson,” White House spokesman Josh Earnest said Tuesday.

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