[http://vancouversun.com/news/local-news/vancouver-aquarium-p... article on the Aquarium's formal report)

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The aquarium now suspects that a toxin is responsible, although no lingering contaminants have been found in the tissues of the dead whales. While intentional poisoning hasn’t been ruled out, it’s also possible that a naturally occurring toxin is responsible.

“The epidemiology of the scenario, the chain of events, lead us to be highly suspect of a toxin that came and went — and one that we may not identify,” Haulena said.

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Investigation continues, but it's a small town and the unproven truth is that one of the people behind this ban poisoned the two whales to 'save them'