I'm not sure of the city but it was in regards to a bus where a man made a remark to the driver about "How do you feel today" and then saying something about "You won't be for long" my quotes not per article.
There was then a substance found on the bus, pellets or something, but in another article was something about an aerosol container with a substance in it. Wish I could remember more ;/
Yes that was it. Vancouver.
Here's the link........
http://www.thestar.com/NASApp/cs/ContentServer?pagename=thestar/Layout/Article_Type1&c=Article&cid=1085609216389&call_pageid=968332188774&col=968350116467
VANCOUVER - A suspicious brown substance believed to have made riders on a Vancouver bus sick on Tuesday was found to be nothing more than pine cones mixed with mud and spices, according to police.
http://www.cbc.ca/stories/2004/05/26/canada/bus040526
Now how do pine cones, mud and spices make one sick????
Thanks for the brain flash It would have bugged me all day if you hadn't come up with it. ;-)