two were aboard the fighter jet, which does have ejection seats, and five aboard the refueler. it was the japanese defense forces that found the one marine alive, but the search continues. >> and martha raddatz back with us tonight. of course, martha, the focus is on the marines and the search that's under way at this hour. but you've learned that the investigation into the cause is already under way tonight? >> reporter: absolutely, david. they'll look at whether weather was a factor, whether fatigue was a factor. but this is really a grim reminder of how even these training missions for the military can be so dangerous. >> all right, martha raddatz, we're thinking of all those families tonight. thank you. we're going to turn next in the meantime tonight to the scare inside the amazon warehouse in new jersey, at the height of the holiday shipping season. more than 50 workers were suddenly sickened. at least one of them critically. abc's david wright on what was behind this. >> reporter: an industrial accident in the frantic runup to christmas, at this amazon fulfillment center in new jersey. >> 50 new canton way at the amazon for strange odor and sick