This was a big warning sign….
Check this out:

Four months before the deadly shooting rampage at a black Charleston church, Dylann Roof was arrested at a shopping mall on a drug charge after going around dressed all in black, asking employees questions that raised suspicions.

He was arrested there again two months later for violating a one-year ban from the mall.

It was not clear what his intentions were. But the operators of the suburban Columbiana Centre mall were concerned enough to put the place on high alert Thursday when Roof was identified as the suspect being sought in the church shooting.