With the Republican nominee Donald Trump being elected as the 45th president of the United States, there remains a large part of the American society that is not happy with the popular mandate, causing instances of rioting on many university campuses across the country.

As Trump took to stage to deliver his victory speech in front of cheering crowds at the Hilton Hotel in New York City on Tuesday, Twitter was abuzz with tweets from sources at a number of universities like University of California, Los Angeles, University of Oregon and University of California, Davis. There were also isolated cases of violence and arson with protestors lighting fires on a street in downtown Oakland, California.

There had been fears of such uprisings across the country in the event of a Trump victory. While the New York Police Department, which owing to its jurisdiction over areas housing both the Trump and rival Hillary Clinton’s campaign had high security plans in place, the Los Angeles Police Department (LAPD) also planned to carry out a contingency plan ahead of the elections.

“The polite thing to say is that this is not unusual, but this has been a very unusual election,” a senior law enforcement official told news website Deadline. “We are ready to go into riot mode if required, if the order comes.”

“Tempers are frayed in a number of our communities from the inflammatory language and policies that some have proposed,” the official added, before the results came out. “If the outcome sees Mr. Trump elected, measures are in place to maintain calm, if need be.”

There were also reports of clashes between some Trump supporters and anti Trump-protesters, which took an ugly turn with a protester reportedly attempting to bite off a Trump supporter’s ear.