Rüfüs Du Sol has made a statement following a fan assault that happened in the crowd at the band’s Saturday (Aug. 16) show at the Rose Bowl in Pasadena, Calif.

In the widely circulating video, a man can be seen repeatedly punching a fellow attendee in the crowd. Festival-focused Instagram channel The Festive Owl quotes a woman involved in the incident who reports that the man also punched her in the face, knocking her out and causing significant bleeding, after which she required attention at the venue’s medical tent. The incident apparently happened after a drink was accidentally spilled on the suspect.

In a statement posted to Rüfüs Du Sol’s social media on the evening of Monday (Aug. 18), the Australian trio says that “delivering moments to our fans to gather and celebrate safely is what we live for. We have been heart broken to hear of the act of violence that took place during the opening act on Saturday. This type of behavior is completely unacceptable anywhere, and the fact that this happened at one of our shows was devastating to learn about. Local law enforcement are actively investigating the situation.”

The statement concludes by asking anyone with information about the incident to contact the Pasadena Police Department.

Beyond the assault, many fans have spoken out online about apparent overcrowding at the concert. Jennifer Philips, a show attendee based in Los Angeles, tells Billboard that she experienced overcrowded and blocked tunnels, exits, walkways and aisles, calling the experience “an absolute chaotic disaster. In all of my years of concerts never have I seen anything like it.”

A representative for The Rose Bowl did not immediately respond to Billboard‘s request for comment.