A video has emerged online of a Sacramento State student appearing to slap the former president of the College Republicans repeatedly on Friday -- and police said they're investigating.

Their scuffle was said to have originated with an online Facebook argument over a mutual friend’s anti-abortion post the previous day, the Sacramento Bee reported.

Keaton Hill allegedly commented on the post: “I hope that kid on your page dies of whatever cancer they have,” prompting a back-and-forth with Floyd Johnson II, the report said.

WARNING: VIDEO CONTAINS GRAPHIC LANGUAGE

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Their dispute carried into a Friday morning class where Hill allegedly hurled an expletive at the former president of the Sacramento State College Republicans, the Bee reported.

After class, Johnson and a friend confronted Hill, the report said. In a video recorded by Johnson, Hill appeared to slap Johnson before leaving the building.

Johnson’s friend could be seen restraining Hill, who shouted, "You're going to end up f---ing dead!" He then broke free and appeared to slap Johnson’s phone out of his hand before walking away a second time.

In a statement to the school’s newspaper, Hill apologized for “lunging at Floyd’s phone” but accused Johnson of provoking him.

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Responding to the incident on the school’s Facebook page, Sacramento State President Robert Nelson said he was “deeply disturbed and appalled to learn that there was a fistfight on campus today between two students.”

“We are investigating the situation, but I want to make it unequivocally clear that violence is never the answer.”

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Johnson has filed a report with Sacramento Police, Chief Mark Iwasa said. Charges were pending amid an ongoing investigation, he said.

Neither Johnson nor Hill immediately responded to Fox News' requests for comment.