A cable television provider apologized Monday to Tucson-area customers over a 30-second porn interruption during the Super Bowl.
Philadelphia-based Comcast issued a brief statement saying the company was "mortified" by the interruption.
"Our initial investigation suggests this was an isolated malicious act," said Comcast spokesman Jennifer Khoury.
Comcast president and general manager Gary Nielsen said its investigation showed the signal left the station with no interruptions or inappropriate material.
Tucson media outlets reported that they received calls from irate viewers about the pornographic material, which aired just after the Arizona Cardinals' Larry Fitzgerald scored on a long touchdown reception during the final minutes of the game.
Second-highestTV ratings ever
The Arizona-Pittsburgh matchup wasn't considered an ideal one for television, but its finish riveted an estimated audience of 95.4 million people, second only to last year's game as the most-watched Super Bowl ever.
Viewership peaked in the fourth quarter, when Arizona took the lead on Larry Fitzgerald's 64-yard catch and sprint to the end zone only to have it snatched back when Santonio Holmes' end zone leap gave Pittsburgh the 27-23 win. More than 100 million Americans were watching between 9:30 p.m. and 10 p.m. EST, according to Nielsen Media Research.
The game was the third most-watched program in American television history, after the 106 million people who watched the M*A*S*H series finale in 1983 and the 97.4 million who watched the New York Giants end New England's bid for an undefeated season in the 2008 Super Bowl.
Arizona's first visit to the Super Bowl hadn't drawn much buzz outside of the Southwest. Pittsburgh has more of a national constituency than its size suggests.
Around the league
Rams: Sylvester Croom, who resigned under pressure as coach at Mississippi State, is the new running backs coach for St. Louis.
Croom became the first black head coach in the Southeastern Conference. MSU was 21-38 in his five seasons.
Panthers: Carolina owner Jerry Richardson, 72, was recovering Monday after a five-hour heart transplant.
The normal recovery time is three to six months.
Titans: Nancy Neville Adams, who co-owned the team with her husband Bud Adams, died Sunday in Houston. She was 84.