. >> with issarin, there's hundre of thousands of tons not far from where you are. how far would it spread? >> reporter: the possible good news, as far as the refugee camps that are over the mountains it's unlikely to come over into those refugee camps. the people who have these concerns understandable concerns but probably not something they need to worry about. it's a heavy gas. if there were small concentrations that made it over the mountain overpasses it would likely not have an effect. this is a psychological terrorism as much as physical. if there's any good news in this, at least for the people further away they're not likely to be affected. >> let's tykeake a quick break. i want to talk to you about the people struggling to survive without food or medical care. back in a moment. ding! ] ...the immune system... [ ding! ] ...heart health... [ ding! ] ...and muscles. [ ding! ] that can only be ensure complete! [ female announcer ] the four-in-one nutrition of ensure complete. a simple choice to help you eat right. [ major nutrition ] nutrition in charge. is th

you'd have to protect the other skin on your body to try to not get exposed to issarin. if you know there's been exposure, you best bet is to run. this is a heavy gas. get out of the particular location. those some of the best pressures if there's been an exposure. these masks, it's kind of sad because it shows the desperation of the situation like this. >> have you been able to speak to anyone who has been affected by this particular attack, february member family members, friends, anyone as you've been traveling around? >> i've been in many of the area ons the bordered. you talk to people who are convinced they may have been exposed. it's hard to verify this wan i was with a man who was convinced his children were exposed to sarin and were able to dpet out in time. it's tough to verify after the fact. you can find sarin in the soils but tougher to find it in the human body. if someone survive, it's likely they be do fine. there's so much angst about it. when you talk to people they say i think i was exposed but it's tough to prove the voracity of that. >> it's almost 1