Great Falls, Mont., station KRTV received nationwide media focus after it broadcast an emergency alert warning of a zombie attack. Yes,  a zombie attack.   The “Steve Wilkes” show was airing when the familiar buzzing sounds of the Emergency Alert System alerted viewers of an important announcement: “Authorities in your area have reported that the bodies of the dead are rising from their graves and attacking the living. … Do not attempt to approach or apprehend these bodies as they are considered extremely dangerous.”    The Montana Television Network said hackers broke into the Emergency Alert System of KRTV and its CW-affiliated station.  The broadcast went out in several Montana counties, and fortunately no zombies were spotted afterwards.