A man arrested for fatally stabbing a black man in Manhattan reportedly told police that the attack was motivated by his desire to kill African-Americans.

James Harris Jackson, 28, told New York Police Department officers that he came to the city from Baltimore in order to kill African-Americans due to his anger toward black men in romantic relationships with white women, the New York Daily News reported on Wednesday.

Jackson, a former army veteran, belongs to a white supremacist group in Maryland and wrote a manifesto outlining his racist beliefs, according to the New York Post.

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After fatally stabbing 66-year-old Timothy Caughman, Jackson turned himself into police, reportedly saying “you need to arrest me. I have the knife in my pocket.”

Jackson is currently being held in police custody.