Dylann Roof has been charged with nine counts of murder and possession of a firearm in connection with a shooting spree at a church in Charleston, according to a Sky news report.
In a post on its Twitter account, Charleston police said Roof will have a bond hearing later on Friday, although he is not expected to attend.
The charges come as South Carolina’s governor said Roof should get the capital punishment.
“We will absolutely want him to have the death penalty,” Governor Nikki Haley told NBC.
“This is an absolute hate crime. We’ve been talking with the investigators because we’ve been going through the interviews, they said they looked pure evil in the eye.”
Reports have said the 21-year-old has confessed to killing nine members of a Bible study group at the historic Emanuel Africa Methodist Episcopal church in South Carolina and said he intended to trigger racial confrontations as a result.
Charles Francis, a spokesman for Charleston Police, declined to comment on reports of a confession.
Roof was arrested on Thursday four hours from Charleston in Shelby, North Carolina.
Earlier a Snapchat by the youngest victim of the shooting – 26-year-old Tywanza Sanders – showed a white male sit among black people at the church before the fatal shootings took place.
One of Mr Sanders’ friends told Mashable: “I didn’t notice until now that Dylann was just a few people away from Wanza.
“You can slightly see him in the right corner of the screenshot.”
Roof is reported to have been in the prayer group meeting for an hour before allegedly opening fire.
A survivor of the attack has said the gunman reloaded five times and when asked to stop shooting, replied: “I have to do it. You rape our women and you are taking over the country. And you have to go.”
Felecia Sanders, who also survived the attack, has described how she played dead while lying on top of her granddaughter to protect her.
The other victims of the shooting have been identified as Reverend Clementa Pinckney; Cynthia Hurd, 54; Reverend Sharonda Coleman-Singleton, 45;
Myra Thompson, 59; Ethel Lance, 70; Susie Jackson, 87; Reverend Daniel Simmons Sr, 74 and Reverend DePayne Middleton-Doctor, 49.
Authorities have been investigating the attack as a hate crime.