When shots rang out in Dallas last week, police zeroed in - wrongly - on men in camouflage gear carrying powerful military-grade rifles.
People can carry such guns openly under Texas law, a provision now under scrutiny for complicating police work in a moment of acute crisis.
About 20 such armed men had joined a march Thursday over the deaths days earlier of two black men at the hands of police, in Louisiana and Minnesota. Some even carried gas masks and wore bulletproof vests.
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The problem began when Micah Johnson, a black 25-year-old one-time Army reservist, launched an ambush attack with an assault rifle, targeting white police monitoring the rally.
A photo provided by Dallas police shows open-carry activist Mark Hughes at the Dallas rally last Thursday.Photo: AP
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When the chaos that engulfed downtown Dallas was over, Johnson had killed five police and wounded seven others, plus two civilians. He told police negotiators before being killed by a robot bomb that he wanted to kill white cops.