Viewers in Arizona have complained after TV coverage of the Super Bowl was interrupted by a pornographic film.

KVOA-TV in Tuscon said it was "dismayed and disappointed" after footage from an adult movie appeared late in the game coverage on the Comcast cable network.

"KVOA will investigate what happened and make sure our viewers get answers," company president Gary Nielsen said.

"When the NBC feed of the Super Bowl was transmitted from KVOA to local cable providers and through over-the-air antennas, there was no pornographic material," he added.

"I just figured it was another commercial until I looked up," viewer Cora King told the Arizona Daily Star.

"Then he did his little dance with everything hanging out."

The Arizona Cardinals had just taken the lead in the match when the disruption occurred. The Pittsburgh Steelers went on to win the title with a late touchdown.