Supporters of Senator Bernie Sanders (I., Vt.) stirred up major unrest at the University of Illinois at Chicago Friday during a scheduled rally for Republican presidential candidate Donald Trump.

A swarm of protesters began holding up signs supporting Sanders and yelling "Bernie, Bernie, Bernie!" as fist fights broke out around the arena and the stage was even taken over by protesters.

Many of Trump's supporters began chanting, "USA, USA, USA!"

The crowd size was estimated to be between 5,000 and 8,500 individuals with an unknown, but large number of protesters.

Young women were seen flipping each other off in each others' faces while things were still calmer.

Police response was slow as the few officers, Secret Service agents and private security tried to respond. The Trump campaign first delayed the rally, then announced that it was cancelled and will be held at a later, unknown date.

The crowds quickly dispersed at this point but much fighting broke out in the streets with first responders trying to break up the fights. The crowd size outside was estimated to be at least another 1,000 people made up of both Trump supporters and opposers.

As of now, there have not been any released numbers of those who were injured or arrested.

There has been, as of now, no response from the Sanders campaign.