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The killing of a gorilla at the Cincinnati Zoo after a 4-year-old boy tumbled into the ape's enclosure triggered outrage and questions about safety, but zoo officials called the decision to use lethal force a tough but necessary choice.

More than 2,000 people signed a petition on Change.org that sharply criticized the Cincinnati Police Department and the zoo for putting down the animal and called for the child's parents to be "held accountable for their actions of not supervising their child."