The twenty-nine-year-old ex-US Marine was gunned down by police during the attack on Sunday morning.
In one of his videos, GAVIN LONG urged blacks to fight back, adding also that he was linked not to any group but is affiliated with justice.
The attack yesterday came two weeks after police shot dead a black man in Baton Rouge, and a second police shooting in Minnesota.
The shootings sparked protests across the United States and triggered a revenge attack by a black army veteran who shot dead five officers in the city of Dallas.
In his response to the latest killings, President BARACK OBAMA called upon all Americans to unite and refrain from divisive language.
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