Here is a link to an article of many on this:
"China Gas Field Blow-Out Kills at Least 191"
Link: (Reuters)
news.myway.com...|top|12-25-2003::10:05|reuters.html
As to your question....I kind of doubt that this would be a "possible chemical weapons accident."
Here's a bit why I think not:
"Xinhua said sulphurated hydrogen is a toxic gas that can poison or kill people who inhale 760 to 1,000 milligrams per cubic meter."
Hydrogen Sulfide is just as deadly as cyanide. Thats simple fact and simply the reason for the high numbers and the evacuations, and evacuations on
such a large scale. This is probably taking into possible account wind direction, etc.
regards
seekerof