The words Tyler, the Creator and “free concert” can lead to trouble. The Odd Future frontman’s show at the Fox Theater in Boulder, Co. almost lead to riot before he even hit the stage. Entrance to Monday night‘s (March 10) Tumblr sponsored show in the University Hill neighborhood was free. However, by as early as 3 p.m., hundreds of fans were already lining up to get into the show that was scheduled to start at 8 p.m.. The Daily Camera reports that around 6 p.m. Boulder authorities were called in to deal with a “riot situation” thanks to an increasingly unruly crowd. Reportedly 80 officers from the Boulder Police Department, University of Colorado Police Department and the Boulder County Sheriff’s Office were called in for crowd control. They came ready, as some of the officers seen in the photos (see the gallery) are wearing riot gear. Officers also closed off streets and dealt with relatively minor incidents of violence. Despite the alleged riot, only two arrests were made. The “Yonkers” rapper added a second show to the bill to allow more fans to get to see him perform considering that the Fox Theater only holds 625 people. That was nice of him. Tyler, the Creator’ new album, Wolf, is due in stores April 2.