Investigators believe the Dallas gunman who shot 14 people, including five murdered police officers, originally planned a much larger attack.

Dallas’ WFAA-TV, citing a law enforcement source with knowledge of the investigation, reported that authorities think Micah Johnson changed his attack plan so the shootings would coincide with Thursday’s protest against police brutality.

“We think he was probably planning something bigger based on what we found at [Johnson’s] house [in suburban Mesquite]”, the source said “He had a bunch of explosive materials. He didn’t have the explosives created.”

Among those materials were metal pipes, as well as chemicals that could be used to create pipe bombs. It was not immediately clear whether Johnson had any specific targets in mind for a larger attack.

The source added that Johnson “literally had hundreds and hundreds of rounds in magazines attached to his body [Thursday] so it wasn’t like he was running out of ammunition … His plan was to kill as many as he could.”

Dallas police Chief David Brown said Friday that authorities found bomb-making materials, rifles, ammunition and a “personal journal of combat tactics.” Dallas Mayor Mike Rawlings described Johnson, believed to be the only gunman in Thursday’s attack, as “a mobile shooter” who had written manifestos on how to “shoot and move — and he did that.”

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