The people “unaccounted for” likely includes many people who got out OK and didn’t get checked in with whoever was there counting noses. They might even have wandered back to the terminal before they got counted.
Probably is the case. KTVU twittered that ONE person is unaccounted for, two deceased, 181 hospitalized and 123 not injured.
Wonder if Reuters was confusing the missing with the number missing in the Quebec train explosion?