The Rev. Sidney Davis leads mourners during a community prayer service for the nine victims of last night's shooting at the historic Emanuel African Methodist Episcopal Church, at Second Presbyterian Church June 18, 2015 in Charleston, South Carolina. Dylann Storm Roof, 21, of Lexington, South Carolina, who allegedly attended a prayer meeting at the church for an hour before opening fire and killing three men and six women, was arrested today. Among the dead is the Rev. Clementa Pinckney, a state senator and a pastor at Emanuel AME, the oldest black congregation in America south of Baltimore, according to the National Park Service.