[brothers4thID]

From a couple of quick view of the video and without the aid of any enhancements, it looks as if the side of the bridge that is not seen on the video ( what would be over your right shoulder if you were taking the video) collapsed first and pulled the rest of the bridge down. It fell straight down and then fragmented in pieces. No puffs of smoke or other signs of imminent failure or man-made trauma immediately before the collapse. Hopefully there is good feed of the other side.

[listenhillary]

That was my take also. Just a note, the youtube video says from the North side of the bridge.