Dylann Roof, 21, of Lexington, South Carolina, was taken into custody without incident shortly before 11 a.m., Shelby police said in a statement. Authorities got a call from a business about a possible sighting of the suspect.

At 10:43 a.m., officers saw the suspect's vehicle, and stopped it at 10:44 a.m., police said. Roof was the vehicle's only occupant.

He was armed with a gun when he was arrested, according to a law enforcement official briefed on the investigation. It's not clear if it's the same firearm used in the shooting.