responders who were called to the fire at the west fertilizer company plant. the tragedy of west, texas was all but lost in the shout of the boston marathon bombing of that week. but on thursday president obama visited west and he had these words of comfort for those who lost loved ones. to the families, neighbors grappling with unbearable los, we are here to say you are not alone. we may not all live in texas, but we're neighbors too. we're americans too. >> mike elk is the labor report r fer in these times magazine. i'm glad you could join me for a few minute today. for follows who have not been following the story as close as you, how did the fire turn so deadly? >> there was 1300 times the amount of aknown yum nitrate in