has housed countless political prisoners, including opponents of the late serbian president slobodan milosevic. many were still there when milosevic himself was incarcerated here in 2001, while awaiting trial for corruption and war crimes. today it houses some of the nation's most dangerous criminals. including the assassin of a former serbian prime minister. >> translator: they have committed all kinds of criminal offenses. basically every criminal offense on the books. these include organized crimes, war crime and other serious criminal offenses such as homicide. >> like american prisons, cz faces the problems of overcrowding. but serbia incarcerates a much smaller portion of its citizens. one out of nearly every 700 versus one out of every 130 in the united states. >> at the moment, a total of 1,200 inmates are being held here which is 2 1/2 times more than the prison's actual capacity. >> while some parts of cz have been modernized, much of the prison shows signs of age of one especially haunting section is completely abandoned behind locked doors. the execution chamber. >> we went down pr

president obama says us intelligence agencies had under estimated the slobodan milosevic at any time group isis. said this in a interview with 60 minutes. cbs news correspondent susan macinnis takes a closer look. >> president obama admits us intelligence underestimated the threat from isis. >> during the chaos of the syrian civil war, where essentially you have huge slots of the country completely un governed, they were table reconstitute themselves and take advantage of the chaos. and, attract foreign nicer. >> in a exclusive interview 60 minutes, the president also said the us over estimated the iraqi army's ability and will to fight. >> the iraqi's have to be willing to fightment and they have to be willing to fight in a non-sectarian way. she against this cancer in their midst. >> us has been bombarding isis tarring nets iraq with air strikes since early august it, began hitting locations cents in syria, almost a week ago. with a co-licks of international partners. >> president obama insists he will not put american combat troops on the grounds to secure the region. allies, loca