PITTSBURGH — University of Pittsburgh Chancellor Mark Nordenberg says students involved in vandalism, fire-setting and other crimes after the Pittsburgh Steelers' Super Bowl win will face discipline and could even be expelled.

City police say more than 80 people were arrested Sunday night as crowds threw bottles at police, set small fires, broke store windows and overturned cars. Much of the violence occurred in the Oakland neighborhood that his home to Pitt's main campus and many of the offenders appeared to be younger people.

Nordenberg says an unspecified number of Pitt students have already been charged by the campus judicial system and others likely will be as police review surveillance videos.

Nordenberg wants to "ensure that this type of disturbance is not repeated on any of our campuses ever again."

NEW YORK — Upon further review, Nielsen Media Research now says that the Arizona-Pittsburgh Super Bowl game was the most-watched in history.Nielsen said 98.7 million people, on average, were watching Pittsburgh's exciting 27-23 victory Sunday night. That beats the 97.5 million who watched the 2008 game, which held the record for most popular Super Bowl.On Monday, Nielsen had reported that this year's game had 95.4 million viewers — impressive, but not a record-setter.Nielsen explained the discrepancy of more than 3 million viewers by saying a more complete check of their records revealed additional viewership on some digital tier networks. The company hadn't been aware that they were showing the game.

COLUMBIA, S.C. — Olympic superstar Michael Phelps could face criminal charges as part of the fallout from a photograph that surfaced showing the swimmer smoking from a marijuana pipe at a University of South Carolina house party.A spokesman for Richland County Sheriff Leon Lott, who is known for his tough stance on drugs, said Tuesday the department was investigating.Phelps, 23, and his team have not disputed the photo's accuracy. Phelps has issued a public apology, acknowledging "regrettable" behavior and "bad judgment" after the photograph appeared.