See: Wizbang for developing story and links to other blogs.
I forgot that the Miami Herald forces you to log in to read their special news. Here is what they are reporting now about the stuff in the container-trailer:
Federal sources said the manifest described the cargo was auto parts, but that is not what was found. Instead, authorities found two 55-gallon containers in the back of the truck.Evidently port operations are disrupted.
Miami-Dade fire's hazmat unit was examining those containers.
Update: Seems the authorities say all is OK, no danger, etc. Gateway Pundit sums it up. Sleep tight, folks.