Elements of Wednesday’s shooting at a Dallas ICE facility raise new questions about whether the suspected gunman who targeted the Dallas ICE office may have taken pages from the playbooks of other high-profile shooters.

Law enforcement sources identified the gunman as Joshua Jahn, 29, from Fairview in Collin County. Investigators say the shooter fired shots at an ICE facility in Dallas, leaving one ICE detainee dead and two others in critical condition.

Authorities say the shooter fired from the rooftop of a building across the street.

Elements of Wednesday’s shooting raise concerns about potential copycats in attacks that law enforcement experts say are hard to defend against.

More than a year ago, it was a sniper on a roof taking aim at President Donald Trump at a campaign rally in P

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