The FBI is not only surveilling Black Lives Matter groups but also feared that "black supremacist extremists" would target the 2016 presidential conventions, according to agency documents.

Records from the FBI and the Department of Homeland Security, which Al Jazeerareleased Tuesday, detail how the government was monitoring Black Lives Matter protests over concerns of violence following the killing of five Dallas officers in July 2016.

A sniper, Micah Xavier Johnson, gunned down the officers following a peaceful Black Lives Matter rally over the deaths of two black men, Alton Sterling and Philando Castile, who were fatally shot by police. A Dallas police bomb squad robot eventually killed Johnson.

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