"And I want you to know that and I want you to feel that deeply - 49 people died because of the rhetoric you put out there".
Forty-nine people were killed in Christchurch on Friday in attacks targeting faithful Muslims during prayers at two different mosques in the city.
"They do matter! This, right here", the activist interrupted angrily, pointing to the vigil, "is the result of a massacre stoked by people like you and the words that you put out into the world!"
"I'm so sorry that you feel that way".
"I'm so sorry, that certainly was never my intention, I believe that words matter", Clinton responds in the video.
Clinton is receiving largely bipartisan support in the wake of the incident.
"After all that you have done, all the Islamophobia you have stoked", a female student can be heard saying to Clinton at the beginning of the video.
Like many other Democrats and Republicans, Clinton distanced herself from the comments. "People haven't forgotten the Islamophobic mob she incited against @IlhanMN".
Some of the NYU students told Clinton she wasn't welcome at the vigil. Ilhan Omar's (D-Minn.) remarks on Israel's treatment of Palestinians and America's financial relationship with the nation.
Is controversy over Rep. Ilhan Omar threatening Democratic unity? The Somali-American congresswoman, one of the two Muslim Americans in the federal legislature, was accused of invoking an anti-Semitic trope and implying that American Jews might have dual allegiance.