A Houston-area family was mourning the death of their 4-old-son who was killed by two pit bulls that attacked as he was playing with his 2-year-old brother. Pedro Rios died of his injuries Tuesday afternoon in a mobile home park east of Houston, the Houston Chronicle reported Wednesday. He and his brother were playing when the dogs approached. The younger boy managed to escape. The boys' mother heard screams and raced to the boy and tried pulling the dogs off but they wouldn't let go until lights and sirens of sheriff's deputies' cars startled them, the report said. Deputies killed...