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PITTSBURGH (AP) - Ten sharks died when water containing a harmful chemical was accidentally pumped into their tank, officials of the Pittsburgh Zoo & PPG Aquarium said Monday.
Staff members noticed the problem almost immediately Saturday but weren't able to save any of the black-tip sharks and a puffer fish, zoo officials said. There were about 100 animals in the tank that were not affected.
The zoo is investigating how the ozone gas, which is used to purify water, got into the tank, said Barbara Baker, president and CEO. Human error is the likely culprit, she said.
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