Phoenix- A Phoenix television station fired an employee suspected of inserting pornography into a broadcast of a news show featuring former NBC News anchor Tom Brokaw.

The unnamed worker for ION Media Networks’ KPPX-TV “was immediately terminated and faces further legal action” after an investigation determined who was responsible for the March 12 incident, spokeswoman Leslie Monreal said in a statement.

Palm Beach, Fla.-based ION Media Networks, which offers family-friendly programs, called the incident “an intolerable act of human sabotage” and apologized to viewers. About 30 seconds of porn was inserted into the broadcast.

Monreal said in a statement released late last week that the images of sex acts only appeared in the Phoenix market.

The images prompted a flood of calls to local news media outlets and the cable television provider.