A Tucson television station’s broadcast of the Super Bowl on Sunday was interrupted for some viewers by about 10 seconds of pornographic material, the station said. KVOA TV in Tucson released a statement saying that the only viewers who were able to see the material were those who receive the channel through Comcast cable. The station said it will investigate the incident. “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,” KVOA’s Gary Nielsen said in a statement.