susannah sirkin, i'm going the start with you. is there more you can tell us at this point about what happened in this attack? >> well, today at physicians for human rights we've had physicians view dozens of photographs and video clips to try to determine exactly what happened, and we've had contact with a number of doctors on the from the line trying desperately to treat those who are injured as well as to deal with those who apparently have been killed as a result of this attack. we know that the medical system such as it is, which has already been devastated by more than almost seven years of war has been responding as best it can, but it is really, as far as we can tell, a situation of chaos and desperation. these kinds of weapons are terrifying inherently because they have no smell, they have no... they aren't seen. they have no taste. and they are detonated essentially in a way that is invisible and then all of a sudden people succumb. it's severely painful. many people who are attacked in this way end up having nerve damag