Before former Mayor Giuliani destroyed local television in NYC by selling off city-owned WNYC-TV Channel 31, I used to be able to catch international television programs that bought time to air their shows. One of these was a block of Japanese news and entertainment every weekday morning. I recall eerie events happening in Japan involving Sarin gas. As it all turned out, a bizarre cult called Aum Shinrikyo was out and about testing their homebrew chemical weaponry, murdering innocent people in the process.
Now Warren Ellis has found this:
Acting chief veterinary officer Fiona Sunderman said toxins were the most likely cause but the deaths could be due to anything from toxic algae to chemicals and pesticides.