A speech by British activist Tommy Robinson in New York was stopped by protesters chanting KKK slogans.
The speech was due to be held at Columbia University via Skype and had been promoted by a group of student Republicans.
However many attendees disrupted the event by holding signs denouncing Robinson, who founded the English Defence League and is seen by many as islamophobic.
Protesters held signs equating Robinson's messages to "violence", and the crowd broke out in a chant of "NYPD, KKK, how many kids have you killed today."
After several minutes of disruption Robinson's speech was aborted and he disappeared from the screen before he could complete his speech, which was supposed to address the rise in European nationalism.
The Columbia University College Republicans Association posted a message on its Facebook page in the wake of the event, saying: "We would like to thank all those who came with well-researched, well-prepared questions and attempted to engage in reasonable discourse. We apologise that many of you did not hear the answers to these questions or get the opportunity to debate Tommy due to the protests.
"We would also like to clarify that we support our fellow students’ right to protest both outside and inside the event. However, we are disappointed that many protesters did not allow those interested to hear Tommy speak and even interrupted his answers to others’ questions."
You can watch footage of the chaos below.
Robinson's appearance in New York was far less successful than his most recent public event, a mass march by the Football Lads Alliance on Saturday (October 7).
The march in London attracted thousands of people, with Robinson filming the entire event for his Rebel Media channel. However critics claim the demonstration, purportedly designed to denounce terrorism, was marred by violence.