Vice President Kamala Harris warned that the nation is experiencing “an epidemic of hate”after an alleged white supremacist gunned down several people on May 14 at a Buffalo supermarket in upstate New York.

"Law enforcement is proceeding with its investigation, but it is clear that we are seeing an epidemic of hate across our country that has been evidenced by acts of violence and intolerance," Harris said Sunday (May 15).

"Racially-motivated hate crimes or acts of violent extremism are harms against all of us," she added.

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According to the Buffalo Police Department, Payton Gendron, 18, entered the Tops Friendly Markets store with a military-style assault rifle and opened fire. Investigators believe it was a racially motivated attack, the Associated Press reports.

He allegedly researched the local demographics and chose that supermarket to kill as many Black people as possible. Gendron shot, in total, 11 Black people and two white people Saturday.

Citing an unnamed law enforcement official, the AP said a preliminary investigation found Gendron had repeatedly visited online sites that promoted white supremacist ideologies and race-based conspiracy theories.

NBC News reports Gendron apparently wrote and posted an explicit public declaration that repeatedly cited the “Great Replacement” theory, which is the false belief that a secret political group is working to replace white Americans with non-white people through interracial marriage, immigration, and inevitable violence.