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Okay, bad joke, but I couldn't resist. The block was compared to a scene from the movie Outbreak with officials dressed in haz-mat suits:

Check out the full article, that describes wires sticking out of teddy bears, green liquid in buckets, and so on. This is better than the movies!:
http://www.chicagobreakingnews.com/2010/08/police-responding-to-possible-bomb-threat.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ChicagoBreakingNews+%28Chicago+Breaking+News%29
Thankfully they found no threat...so please, friends, still come and visit me, we're in the clear!