A gunman fired upon a Dallas immigration field office from a nearby roof Wednesday morning, killing one detainee and critically wounding two others before taking his own life in what authorities called an indiscriminate attack on U.S. Immigration and Customs Enforcement. Perry Russom has the details. Nicole D'Antonio reports on White House officials telling agencies to prepare large-scale firings of federal workers if the government shuts down next week; Danny New talks to a daughter of acting royalty who achieved a milestone at 31, which most reach at 16 -- getting a driver's license; and more on ABC’s GMA First Look.

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