here imminent explosion sending families fleeing in ohio. a train carrying dangerous chemicals derailing, forcing evacuations. several of the cars carrying vinyl chloride. and tonight, the careful operation under way at this hour at the site. trying to avert a potential explosion. tonight, news on that chinese spy balloon shot down by the u.s. by an f-22. the teams moving quickly to recover key pieces. the debris field more than 15 football fields wide. and what we re already learning tonight about the balloon, how it maneuvered. and the trained u.s. navy teams now using unmanned, underwater vehicles to detect whether there could be any explosives. martha raddatz right here with me tonight on what she s learned. here in washington, president biden on the eve of his state of the union address, after that very promising jobs report, and after some key victories, including that bipartisan infrastructure law. the white house knows many americans still are not feeling this. wh
here at home this evening, the warnings of a possible imminent explosion sending families fleeing in ohio. a train carrying dangerous chemicals derailing, forcing evacuations. several of the cars carrying vinyl chloride. and tonight, the careful operation under way at this hour at the site. trying to assert a potential explosion. tonight, news on that chinese spy balloon shot down by the u.s. by an f-22. the teams moving quickly to recover key pieces. the debris field more than 15 football fields wide. and what we re already learning tonight about the balloon, how it maneuvered. and the trained u.s. navy teams now using unmanned, underwater vehicles to detect whether there could be any explosives. martha raddatz right had here with me tonight on what she s learned. here in washington, president biden on the eve of his state of the union address, after that very promising jobs report, and after some key victories, including that bipartisan infrastructure law. the white hou
help, help, a woman responds. at least 45 countries pledging support, including the united states. president biden speaking with turkey s president erdogan late today, saying u.s. search and rescue teams are, quote, deploying quickly to the region. the scope of this is just unimaginable tonight. marcus moore with us from istanbul, turkey. and marcus, i know the search for survivors well under way. they will not give up, they never do, and we all expect this to last for several days, this search for any potential survivors? reporter: and david, the next 24 to 48 hours will be critical. more than 5,600 buildings collapsed here in turkey and in syria, trapping scores of people in the rubble. with below freezing temperatures and now winter snow falling on those devastated towns and villages tonight. david? marcus moore in turkey. marcus, thank you. meantime, back here in the u.s. tonight, and to the urgent call to evacuate amid fears of
sludge, barely able to hold herself up. finally, with some help, she is lifted on to a helicopter, covered in mud, appearing exhausted. she is rescued in a deadly disaster submerging homes, roads, cars, buses and people. it began when a mining dam burst early friday afternoon near a southeastern city in brazil. huge rivers of mud rushing over the city, trapping scores of people. dozens of rescue workers have been deployed to free them, fighting against the dense mud. a mining giant that manages the collapsed dam apologized for the diz astzer. the ceo asking for forgiveness. this is not the first tragedy for this mining company or this region of brazil. they have made an immense effort to improve dams after a similar