USA / NORTH KOREA - North Korea Calls US `Kingpin of State-Sponsored Terrorism'
http://www.bloomberg.com/apps/news?pid=10000087&sid=ae4Bw.79Pjj8&refer=top_world_news
BOSTON - Hospital hit with anthrax-like powder
"brownish-tan granular powder," similar in appearance to the biological agent anthrax"
http://www.dailyfreepress.com/news/2005/05/03/News/Hospital.Hit.With.AnthraxLike.Powder-946906.shtml
OKLAHOMA - Former Wakita man publishes book for first responders
http://progress.enidnews.com/story.php?story_id=307&c=f22&PHPSESSID=b03c57d500e6a0645be79bc50ce9d40e
[Interfax] USA - Biological weapons are more dangerous than nuclear - expert
http://www.interfax.ru/e/B/politics/28.html?id_issue=11278243
Your second link may provide a suggestion about the intruders....planting phony anthrax?