Alleged Buffalo shooter Payton Gendron has pleaded not guilty to the arraignment

The suspected deranged mass shooter who shot dead ten people in a “racially motivated” killing spree at a Buffalo supermarket was before a judge hours after the massacre on Saturday afternoon.

Payton Gendron, 18, of Conklin, New York, wore a white paper dress and mask and was surrounded by police officers during his arraignment Saturday night in Buffalo City Court, according to WKBW-TV.

Gendron was stoic when his court-appointed attorney pleaded not guilty on his behalf to first-degree murder charges, the broadcaster said.

He was reportedly remanded in custody without bail and was brought back to court on Thursday.

Gendron reportedly killed 10 people and injured three others around 2:30 p.m. at a Tops grocery store in a predominantly black neighborhood. Eleven of the victims were black and two were white.

He had driven about 200 miles from his home near Binghamton to carry out the sick mass shooting and was heavily armed and carrying tactical gear, officials said.

The shooting began in the supermarket parking lot and continued inside the store before he was arrested by Buffalo police.

“It was pure evil. It was a racially motivated hate crime by someone outside of our community, outside of the town of good neighbors…who came into our community and tried to do this evil to us,” Erie County Sheriff John Garcia said at a news conference.

The FBI was investigating the incident as both “a hate crime and a case of racially motivated violent extremism,” Special Agent Stephen Belongia said.

“The depth of pain that families are feeling and that we are all feeling right now cannot even be explained,” said Buffalo Mayor Byron Brown.