Payton Gendron of Broome County, New York, 18, was charged with first degree murder in a mass shooting that left 10 dead and three others injured at a supermarket in Buffalo, New York on Saturday.
He was arrested on Saturday evening and pleaded not guilty.
“I understand my charges,” were the only words he spoke in court, seated alongside a court-appointed lawyer.
The teenager appeared in court in a medical-style white gown and face mask.
Following the charges, a judge dismissed Mr. Gendron without bond, and he will appear in court in five days for a felony hearing.
New York Governor Kathy Hochul ripped the 18-year-old during her remarks on Saturday, condemning him for an “evil” act of “white supremacy” and “terrorism”.
“Yes, I’m here to comfort the families of a community that is hurting so much right now,” she said. “But believe me, we will be aggressive in our pursuit of anyone who subscribes to the ideals held by other white supremacists.”
She also criticized social media companies for allowing white supremacy and other hateful ideologies to proliferate online.
“They created the platform that allowed this hate to be spewed out,” she said.
Police said Mr Gendron broadcast the shooting and live video service Twitch confirmed the alleged shooter used its platform to broadcast his video, before it was taken down.
The Independent Gt