NUEVO LAREDO, Mexico — One of five police slain here since last Sunday lay in a casket below a fresh layer of dirt as a small crowd of family, but no uniformed officers, gathered under a white tent, umbrellas or no shade at all. Except for a woman who cried "Oh, my God," and the constant, melting bawl of the officer's oldest son near the end of the service, it was a quiet burial following another violent death. Someone attacked officer Ricardo Uvalle Escobedo, 33, as he drove to work early Tuesday on a typically busy street. He stopped and...