(AP) -- The official said on Monday that 133 detainees were transferred from the Riyan airport.

It's one of 18 secret prisons that an Associated Press investigation revealed as run by the United Arab Emirates or its allies, where former prisoners said torture was widespread. The UAE denies the allegations and says all prisons in "government"-controlled territory are run by Yemeni authorities.

The official says there are no more prisoners in Riyan and that the airport will reopen soon. He spoke on condition of anonymity because he wasn't authorized to speak to reporters.

Families of two detainees say their sons were moved to a new prison.

(File Photo: AP)