there is just feet in between stories where there were ten feet. that is heartbreaking because it doesn't mean to me that we'll be successful -- as successful as we would want to be to find people alive. >> authorities point out that not everyone who is unaccounted for is definitely missing. some may not have been home when the building collapsed. and not everyone unaccounted for is a u.s. citizen. matt rivers reports. >> reporter: as we learn more and more about the victims of this partial collapse, it is becoming more and more clear that the united states is not the only country whose seths h citizens have been ektd if aed by this tragedy. we heard on thursday from the foreign ministry of pararaquay saying that the sister of the first lady of paraquay and her family are not unaccounted for