Pa. zoo: Wild dogs killed boy who fell in exhibit - Article Photos 20/21

A sign indicating the zoo is closed is seen next to a car with a security guard at the entrance to the parking lots for the Pittsburgh Zoo and PPG Aquarium on Monday, Nov. 5, 2012, in Pittsburgh. Zoo officials said a young boy was killed after he fell into the exhibit that was home to a pack of African painted dogs, who pounced on the boy and mauled him on Sunday, Nov. 4, 2012. It's not yet clear whether the boy died from the fall or the attack, said Barbara Baker, president of the Pittsburgh Zoo & PPG Aquarium. (AP Photo/Keith Srakocic)