The South Carolina and US flags are seen flying at half-staff behind the Confederate flag erected in front of the State Congress building in Columbia, South Carolina on June 19, 2015. Police captured the white suspect in a gun massacre at one of the oldest black churches in Charleston in the United States, the latest deadly assault to feed simmering racial tensions. Police detained 21-year-old Dylann Roof, shown wearing the flags of defunct white supremacist regimes in pictures taken from social media, after nine churchgoers were shot dead during bible study on Wednesday. AFP PHOTO/MLADEN ANTONOVMLADEN ANTONOV/AFP/Getty Images