and these are just preliminary reports, that would not necessarily be the red line, use of chemical weapons that people have been talking about. that is not yet confirmed. but the possibility of it being used in mariupol was actually raised yesterday by officials. so that s one possibility. another one, that s one possibility. another one, that us officials have raised, is that us officials have raised, is that they could be some kind of riot control agent, tear gas or something being used against people. so far there are less signs and confirmation that it is something as serious as a nerve agent, what we typically think of chemical weapons, the kind of thing used in syria. to know will take some investigation, it will take samples being taken and people will need to look at the symptoms people are showing to be sure what it was and that will be taking place as we speak. so far people are certainly being quite cautious about leaping to the conclusion that this is the most serious end