A video of the incident between Michigan State and Michigan players appeared to show the second skirmish between players following the Wolverines’ victory over the Spartans on Saturday.

Michigan head coach Jim Harbaugh said in the postgame press conference there were two incidents in the aftermath of the game, but until Sunday only one of the incidents was documented. The second video surfaced and appeared to show a Spartans player using his helmet to hit a Wolverines player.

"Absolutely disgusting," the video was captioned.

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The first incident centered around Michigan defensive back Ja’Den McBurrows. Videos posted to social media appeared to show at least three Michigan State players pushing, punching and kicking McBurrows in and near a hallway that does not lead to either team's locker room.

There didn’t appear to be any other Michigan players near McBurrows when the incident occurred.

Harbaugh said a second player, who wasn’t identified, was also attacked and one was injured and might have a broken nose.

"Two of our players were assaulted," Harbaugh said. "I saw on the one video — 10 on one. It was pretty bad. It needs to be investigated."

An investigation is underway in partnership with Michigan State University Police and Michigan’s athletic department and football program, University of Michigan Deputy Chief of Police Melissa Overton said.

"Situations like these, and the safety of the community, are taken very seriously," Overton said.

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Michigan athletic director Warde Manuel said Big Ten Commissioner Kevin Warren, who attended the game, is also looking into the fight.

"What happened after the game was completely unacceptable," Manuel said. "I talked to the commissioner. He's looking into it. The police is looking into it because they've seen the video. This is not how we should interact after the game. … This is not what the rivalry should be about. It should not be how it is remembered."

Another video showed a fan touching Michigan State head coach Mel Tucker on the top of the head. Tucker then took a swipe at the fan.

"I know it was a heated game," Tucker said of the tunnel incident. "We were trying to get our guys in the locker room. We’ll have to see what happened."

Tucker added more in tweets Sunday: "As Spartans our program has a responsibility to uphold the highest level of sportsmanship. While emotions were very high at the conclusion of our rivalry game at Michigan Stadium, there is no excuse for behavior that puts our team or our opponents at risk.

"In complete cooperation with law enforcement, the Big Ten Conference and MSU and UM leadership, we will evaluate the events in Ann Arbor and take swift and appropriate action."

The Associated Press contributed to this report.