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Authorities were searching for Dylann Roof, the man alleged to be involved in a shooting that left nine people dead at a historic black church Wednesday.

The FBI confirmed Thursday Roof, 21, of Lexington County, is the suspect authorities say shot six women and three men during a service at Emanuel AME Church.

Police say Roof is clean-shaven, with a slender build and was last seen wearing a gray hoodie, blue jeans and Timberland boots.

“He obviously is extremely dangerous,” Police Chief Gregory Mullen said.

>> PHOTOS: Shock, grief after 9 killed at historic black church in Charleston

Roof sat and attended a service at Emanuel AME Church for nearly an hour before opening fire, killing six women and three men.

He then left in a black sedan.

Roof's motive is unknown and police don't know if anyone else is targeted.

Police are asking anyone with information about Roof to call 843-743-7200 or 1-800-225-5324

Here is more on the shooting:

>> RELATED: 9 killed in mass shooting at AME church in Charleston, S.C.