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.

All three victims were in a transport van outside the facility at the time, the Department of Homeland Security said in a statement. Authorities said they found ammunition with anti-ICE messaging at the scene.

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