At one moment, an apartment building was standing. At another, it had tumbled into a hole. Ruin, and death, followed. Raw video captures the chaotic immediate aftermath and the frantic rush to rescue victims following a fatal building collapse in the Flatbush section of Brooklyn. A timeline reveals how the deadly New York City building collapse at 1321 Flatbush Ave. unfolded, from the first 911 call to a frantic rescue.