NBC 5 Investigates is learning more about the suspected gunman who fired shots at an ICE facility in Dallas that left one detainee dead and two others in critical condition.

The shooter has been identified as Joshua Jahn, 29, from Fairview in Collin County.

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Authorities say the shooter fired from the rooftop of a building across the street from an ICE enforcement operations building that's located along Stemmons Freeway in Dallas.

A source with direct knowledge of the situation tells NBC 5 Investigates that the suspect used a bolt-action rifle before the gunman apparently took his own life.

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Experts say hardening ICE facilities to protect against sniper-style at

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