Donald Trump cancelled a rally tonight, saying he didn't want to see "people get hurt" after protesters packed into the Chicago arena where it was to take place.

The announcement that the billionaire businessman would postpone the rally until another day led a large portion of the crowd inside the University of Illinois at Chicago Pavilion to break out into raucous cheers.

Some physical confrontations occured between some members of the crowd. Meanwhile, supporters of the candidate started chants of their own.

Trump told Greta Van Susteren that he cancelled the event after meeting with law enforcement.

"I didn't want to see people get hurt (so) I decided to postpone the rally. ... What we did was intelligent," Trump said. "A very good decision..a wise decision."

Watch Trump's response above and