UPDATE III: The apparent passenger adds, "Lots of activity here. Friends, pls don't call right now. I'm fine. Most people are totally calm and trying to let the fire and rescue do their jobs. Just like during 9/11, most people are great and try to be helpful in crisis... David Eun"
UPDATE IV: A "loud boom" was reportedly heard by witnesses:
Yes, I think that guy gets credit for breaking the story with his tweet. I first saw it over at Ace of Spades Mr. Eun got re-tweeted by Dan Riehl. When I came over here even Drudge and the Radio didn’t have it, per the thread.
Mr. Eun is some kind of exec with Sony or something, I just read elsewhere.
I hope it wasn’t the infant who was killed, they just sit on mom or dad’s lap.