Original sentence: One such facility was the Level -4 detention center in the Interior Ministry building.The existence of other official and unofficial sites that Tehran riot police and Basij members used to detain suspects charged with endangering national security and public safety during the 2009 election protests have since been revealed
Edited sentence: Tehran riot police and Basij members used other official and unofficial sites to detain suspects charged with endangering national security and public safety during the 2009 election protests, including the Level -4 detention center in the Interior Ministry building