Some Montana couch potatoes got quite a shock Monday, when an automated alert message warned viewers that "dead bodies are rising from their graves," in several counties. "Do not attempt to approach or apprehend these bodies as they are extremely dangerous.

KRTV, a CW affiliate, issued an apology to viewers, claiming the message was the work of a hacker.

Lt. Shane Sorensen of the Great Falls Police Department says his officers are investigating who was behind the message, and explained he had four calls from residents checking to see if it was true.

Watch what happened here.