A security guard closes the gate at the Pittsburgh Zoo, where a 2-year-old boy was killed Sunday.
November 5, 2012 In Pittsburgh, the 2-year-old's mother lifted him on to a railing. Tragically, he fell into the animals' exhibit and was set upon by the pack. Zookeepers were eventually able to lure most of the 11 dogs away. One had to be shot by police.
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