over sen serven states discovere hour north of mexico city. they discover one kilometer away from the vehicle the container of cobalt 60 radioactive material which had been open. most of the cobalt appears to have been there. at this stage, nuclear safety officials are trying to establish for sure whether or not it has gone missing. they're in the process of determining that. it's a hive of activity, obviously, as you can imagine. radiation was discovered in that area. >> so, nick, tell us about the area here, the neighborhood. how many people potentially could be sick? what about these guys exposed to theed theed a yo active. they could be in danger of getting sick and dying from the radioactivity. >> could they be dead already? a fair exposure, wasn't it? >> well, at this stage, they are still at large.