Police say a 5-year-old boy has been mauled to death by a dog on the South Side of Chicago. Police say the attack happened Monday night. The boy was taken to Advocate Christ Medical Center, where he was pronounced dead. Neighbors say people hit the dog with rocks and other objects, killing it and freeing the boy. They say the dog was a pit bull. Marquis Lewis says he didn't realize at first that the boy was being mauled. Police are investigating. No charges have been filed or tickets issued.