<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by gfowler-ord-1k:
Urea is a high nitrogen (46%) fertilizer. Can be used to make bombs. Not a good thing to be sitting around an airport.
</font>
Before you jump to conclusions...
Urea is one of the de-icing substances used at an airport. No worries.