The disappearance was discovered when inspectors from the IAEA visited the city on Tuesday, says IAEA chief Rafael Grossi.
The uranium is said to have been stored in 10 barrels, but when the nuclear energy inspectors came to the site on Tuesday, the barrels were nowhere to be found.
According to Grossi, the place where the uranium has disappeared from is not under the control of the Libyan government.
The IAEA informed member countries of its findings on Wednesday evening in Vienna, where the IAEA has its headquarters.
The inspection should have been carried out in 2022, but has been postponed due to a lack of safety, writes Reuters.
The IAEA has launched an investigation to find out where the barrels might have gone. They warn that the uranium represents a possible radiation hazard and is a security risk.
The IAEA states that it must be concentrated uranium ore (uranium ore concentrate).
