I've been following a discussion on the subject on the Minor Planets Mailing List. Apparently people did see a bright fireball (it was day) and heard an explosion (sonic boom?). A member of the Geological Society of Canada visited the impact site and reported that the ground where the meteor hit consists of clays that could have smelled very unpleasant if the groundwater was boiling. Also, a 20 cm fragment of a metallic meteorite may have been recovered.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman