Dallas Police Chief David Brown said early Sunday that shooting suspect Micah Xavier Johnson was planning a larger attack.

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Brown said on CNN’s “State of the Union” that Johnson was practicing “explosive detonations,” adding that he had enough bomb-making materials to have “devastating effects.”

“We’re convinced that this suspect had other plans,” Brown said, adding that Johnson thought what he was doing was “righteous.”

Brown also said that Johnson’s plans were underway well before police-involved shootings of two black men in Minnesota and Louisiana last week, adding that those incidents “sparked his delusion to fast track his plans.”

Johnson was killed by a department robot after an attack late Thursday in which five Dallas police officers were shot by sniper fire.