Internet-connected and driverless cars could be targets for hackers – potentially including terrorists and hostile nations – so the automotive industry must ensure vehicles have built-in cybersecurity protection, a top U.S. Justice Department official said. “There is no Internet-connected system where you can build a wall that’s high enough or deep enough to keep a dedicated nation-state adversary or a sophisticated criminal group out of the system,” John Carlin, U.S. assistant attorney general for national security, said Tuesday at an auto industry conference in Detroit.