June 19, 2015 5:30 PM EDT

After Dylann Roof shot nine people dead at a Charleston, S.C. church, he stood over a witness who had survived the massacre and used a racial slur, according to newly released documents.

Roof, 21, walked into the Emanuel African Methodist Episcopal Church at 8:06 p.m. on Wednesday, where he was welcomed by church members into a Bible study circle, according to an arrest affidavit obtained by TIME. After about an hour of studying, Roof drew a .45 caliber pistol from his fanny pack and attacked the parishioners, firing “multiple shots” at at least one of the victims, the affidavit says. Roof then stood over a surviving witness and “uttered a racially inflammatory statement,” according to the affidavit. The church’s surveillance camera captured footage of the fleeing gunman, who was later identified as Roof by his father and uncle.

Roof has been charged with nine counts of murder and one count of possession of a deadly weapon. Grieving family members confronted Roof for the first time during an emotional bail hearing on Friday. Authorities said they were investigating the shooting as a hate crime.

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