Iranian officials, in a first, have admitted to facilitating the 9/11 terrorist attacks in the U.S. by secretly aiding the free travel of al Qaeda operatives who eventually went on to fly commercial airliners into the Twin Towers in New York City, according to new remarks from a senior Iranian official.

Mohammad-Javad Larijani, an international affairs assistant in the Iran’s judiciary, disclosed in Farsi-language remarks broadcast on Iran’s state-controlled television that Iranian intelligence officials secretly helped provide the al Qaeda attackers with passage and gave them refuge in the Islamic Republic, according to an English translation published by Al Arabiya.

“Our government agreed not to stamp the passports of some of them because they were on transit flights for two hours, and they were resuming their flights without having their passports stamped. However their movements were under the complete supervision of the Iranian intelligence,” Larijani was quoted as saying.

The remarks represent the first time senior Iranian officials have publicly admitted to aiding al Qaeda and playing a direct role in facilitating the 9/11 attacks.

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