Approximately 50 people were arrested outside the Art Institute of Chicago during a demonstration on Saturday, according to the institute, Paralel.Az reorts citing CNN.

A demonstration, including some School of Art Institute of Chicago students, started on Saturday morning in the North Garden of the museum, according to an institute spokesperson.

As time went on, protesters “shoved a security officer and stole their keys to the museum, blocked emergency exits, and barricade gates,” according to the spokesperson.

Officers offered a new location to the group to continue their protest, but they refused. “During multiple rounds of negotiations, SAIC student protesters were promised amnesty from academic sanction and trespassing charges if they agreed to relocate,” the spokesperson said.

Negotiations continued for about five hours and an agreement was never reached.

Chicago Police decided to end the protest in “the safest way possible” and arrested approximately 50 people, according to the spokesperson.

CNN has reached out to the Chicago Police Department for additional information.