Johnson was an Army Reserve Afghan War veteran and was angry over police shootings of black men. [29][30][31][32][33] The decision to attack Johnson with a robot was made after it was concluded that the heavily armed assailant had secured himself behind a corner at the end of a hallway, with no safe way for police to rush him or reach him with a sniper. This included $86,000 spent by the Dallas County Sheriff's Office, $88,000 spent by the Arlington Police Department, about $705,250 by DPD, and unknown sums by the Irving Police Department and the Dallas Fire-Rescue Department. [97][65], Johnson had no criminal record in Texas. [21] However, the latter claim was contradicted on July 18 by two officials familiar with the investigation, who both said small amounts of Tannerite, a binary explosive used to make explosive targets for gun ranges, and acetone, an accelerant in explosives, were recovered from the home. Johnson stated that he had acted alone and was not part of any group. When the man asked the ATF if his weapon played a part in the shooting, the ATF agent who responded said, "All we can say is it was recovered. For the same reasons, officers weren't able to arm with long guns, such as AR-15. 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