2013 Emergency Alert System hijackings

On February 11, 2013, the Emergency Alert System (EAS) of five different television stations across the U.S. states of Montana, Michigan, Wisconsin, and New Mexico were hijacked, interrupting each television broadcast with a local area emergency message warning viewers of "bodies of the dead" whom are "attacking the living". The message was subsequently declared as a hoax by local authorities and was reported to be a result of hackers gaining access to the Emergency Alert System equipment of various television stations.

Source: Wikipedia — 2013 Emergency Alert System hijackings (CC BY-SA 4.0)