A Social Security and Medicare rally at Westlake Park that featured Democratic presidential candidate Bernie Sanders was interrupted by activists with Black Lives Matter on Saturday afternoon.

As Sanders went up to the podium, activists took the stage to protest.

Sanders stood aside as the activists spoke.

Sanders was scheduled to speak at the event, but due to the disruption the event ended.

Activists asked for attendees to honor a 4.5 minute moment of silence to honor Michael Brown, who was shot during a confrontation with police in Ferguson, Mo. a year ago.

After the speech Sanders released this statement:

"I am disappointed that two people disrupted a rally attended by thousands at which I was invited to speak about fighting to protect Social Security and Medicare. I was especially disappointed because on criminal justice reform and the need to fight racism there is no other candidate for president who will fight harder than me."