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This undated photo provided by the Dallas County Sheriff's Department shows Armando Juarez. Juarez is accused of shooting and critically wounding multiple Dallas police officers and hurting an employee at a Home Depot store as he led law enforcement on a high-speed car chase before he was captured in a late-night arrest Tuesday, April 24, 2018. Police arrested Juarez on charges of aggravated assault on a public servant and felony theft. (Dallas County Sheriff's Department)

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Warrant: Suspect's suspicious behavior drew police attention

The gunman accused of opening fire at a Dallas home improvement store — killing one police officer and critically injuring two others — was initially detained because he was acting suspiciously and may have tried to steal from the store, an arrest warrant revealed Wednesday.