The 21-year-old is charged with nine counts of murder in Wednesday's brutal slayings

By Tara Fowler
Updated June 19, 2015 10:25 AM
Credit: Columbia Police Dept

Dylann Roof, the 21-year-old accused of killing nine people at Emmanuel AME Church in Charleston, South Carolina, reportedly told investigators that he almost scrapped his deadly plans.

Roof was arrested in North Carolina on Thursday and was flown back to South Carolina after he waived extradition. He is charged with nine counts of murder.

Sources told NBC News that Roof confessed to the brutal slayings that left nine dead, adding that he claimed he “almost didn’t go through with [the shooting] because everyone was so nice to him.”

However, he eventually decided to “go through with his mission” after sitting with the parishioners for about an hour, sources said.

Roof also allegedly told investigators that he wanted to start a race war, according to CNN.

Before Roof opened fire, a young parishioner at the church confronted him and tried to calm him down, Sylvia Stevenson Johnson, cousin of slain Rev. Clementa Pinckney, told PEOPLE.

Roof allegedly responded: “No. You’ve raped our women and you’ve stolen and you’ve taken over the country, so no, this must be done,” Johnson said.

Roof is due in court at 2 p.m. ET.

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