DUBAI, United Arab Emirates — Iran is acknowledging for the first time that it has an open case before its Revolutionary Court involving Robert A. Levinson, a former F.B.I. agent who disappeared in 2007 under still-mysterious circumstances while on an unauthorized C.I.A. mission to the country.
In a filing to the United Nations, Iran said the case over Mr. Levinson was “ongoing,” without elaborating.
Mr. Levinson was last seen alive about eight years ago, in a hostage video pleading for help and in photographs wearing a Guantánamo-style jumpsuit. The images did not disclose who was holding him, though the video has a Pashtun wedding song popular in Afghanistan playing in the background.
It wasn’t immediately clear how long the Iranian case had been open, nor the circumstances under which it started. However, it comes amid a renewed push to find Mr. Levinson with an offer of $20 million for information from the Trump administration amid heightened tensions between Iran and the United States over Tehran’s collapsing nuclear deal with world powers. That’s in addition to $5 million earlier offered by the F.B.I.
The Associated Press on Saturday obtained the text of Iran’s filing to the United Nations’ Working Group on Enforced or Involuntary Disappearances.
“According to the last statement of Tehran’s Justice Department, Mr. Robert Alan Levinson has an ongoing case in the Public Prosecution and Revolutionary Court of Tehran,” the filing said.
It did not elaborate. Iran’s Revolutionary Court typically handles espionage cases and others involving smuggling, blasphemy and attempts to overthrow its Islamic government. Westerners and Iranian dual nationals with ties to the West often find themselves tried and convicted in closed-door trials in these courts, only later to be used as bargaining chips in negotiations.
Iran’s mission to the United Nations did not immediately respond to a request for comment and its state media has not acknowledged the case.
The Washington Post first reported on the ongoing case.
Mr. Levinson disappeared from Kish Island, off the coast of Iran, on March 9, 2007. For years, United States officials would only say that Mr. Levinson, a meticulous F.B.I. investigator credited with busting Russian and Italian mobsters, was working for a private firm on his trip.
In December 2013, The A.P. revealed that Levinson in fact had been on a mission for C.I.A. analysts who had no authority to run spy operations. Mr. Levinson’s family had received a $2.5 million annuity from the C.I.A. in order to stop a lawsuit revealing details of his work, while the agency forced out three veteran analysts and disciplined seven others.
Rumors about Mr. Levinson’s fate have circulated for years, with one account claiming he was locked up in a Tehran prison run by Iran’s paramilitary Revolutionary Guard and United States officials suggesting he may not be in Iran at all. Dawud Salahuddin, an American fugitive living in Iran who is wanted for the assassination of a former Iranian diplomat in Maryland in 1980, is the last known person to have seen Levinson before his disappearance.
Iran has offered a series of contradictory statements about Mr. Levinson in the time since. It asked the United Nations group to close its investigation into Mr. Levinson in February, saying “no proof has been presented by the claimant in this case to prove the presence of the aforesaid in Iran’s detention centers.”