Investigators are looking at a website featuring a racist manifesto that mentions Charleston as the "historic" target of an attack and displays images of Roof.

The 2,000-word text explains the writer's philosophy of white superiority, saying the Trayvon Martin case "truly awakened me" and that "I chose Charleston because it is most historic city in my state, and at one time had the highest ratio of blacks to Whites in the country."

Motive has become the biggest question as state and federal investigators work on the case -- and statements and photos on the website match what investigators have determined so far.

Martin's parents, Sybrina Fulton and Tracy Martin, addressed the gunman's assertion. Their son was killed by in 2012 by a neighborhood watch volunteer who was acquitted.

"The Trayvon Martin movement was not created to incite hate or further racial divide, but rather birthed to raise awareness to the social injustices that exist across America with regards to senseless gun violence against our young black and brown boys; the movement also focuses on the growing disparities in the lack of prosecution of the actual perpetrators," they said in a statement.

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