debora patta reports from syria. >> reporter: this is what the aftermath of an artillery strike sounds like as the syrian military continues the assault on the rebel-held parts of aleppo. dozens of people were killed in this attack. grief hangs in the air. this teenaged boy just lost his mother in the strike. "one of my sisters was pulled out alive, "he said. "but i don't know about the other." he is one of tens of thousands of civilians caught in the cross-fire as the syrian army continues to advance. they face an impossible choice-- to stay means facing a daily barrage of bombs. but to run can be just as deadly. this woman died in the street with a backpack on her shoulders. those who managed to escape are being housed in makeshift shelters, many already filled to capacity. this old factory houses over 8,000 people, but still, they keep arriving and ne new beds he to be found. remarkably, children play, perhaps to forget the horror of what they have seen. old men cry, perhaps because they can't forget. in an impassioned plea to the united nations today, anthony, emergency relief coor

. >> mason: debora patta in damascus, thanks. it's all but certain president obama will leave office without fulfilling one of his original campaign promises-- to shut the u.s. military prisprizon for terror suspects in guantanamo bay, cuba. dozens remain locked up there. margaret brennan got a rare inside look at the >> reporter: these are the remnants of guantanamo's notorious camp x-ray, where hundreds of suspected terrorists were caged in the panicked aftermath of 9/11. the picture today is far different. the 60 remaining detainees, whose faces we were not permitted to film, lounge in modern, open cell blocks, eating and praying regularly. over the past eight years, 180 detainees have been released from guantanamo, leaving most of the prison empty. donald trump has vowed to reverse course. with some bad dudes, believe me. we're going to load it up. >> reporter: admiral peter clarke, who commands the ketension facility, says there is room for hundreds more prisoners. but he vowed never to use harsh interrogation methods like w