The vehicle, which rear-ended a pickup truck south of Phoenix, was operating illegally from Mexico, authorities say. Sixteen people are injured. Reporting from Denver - A bus operating illegally from Mexico and traveling through Texas and Arizona to Los Angeles slammed into the back of a pickup truck and rolled over early Friday morning in the Arizona desert, killing six passengers and injuring 16, authorities said. "No one walked away unscathed," Arizona Department of Public Safety spokesman Robert Bailey said from the crash scene, about 30 miles south of Phoenix. The bus company, Tierra Santa Inc. -- which has offices...