Also, the question shouldn't be "Did they know it was harmless?" It should be "Did they know it was harmful?" You don't initiate a huge hazmat incident, close o

Also, the question shouldn't be "Did they know it was harmless?" It should be "Did they know it was harmful?" You don't initiate a huge hazmat incident, close off homes and evacuate people just because "you're not sure it was harmless." You do that when you know it's harmful.