DALLAS — For the second time in two weeks, a shooter on a rooftop inflicted death on the ground, this time at a U.S. Immigration and Customs Enforcement facility in Dallas, where a detainee was killed and two others were critically wounded by the gunman, who then fatally shot himself.

The Department of Homeland Security said in a statement that shots were fired indiscriminately early Wednesday at the ICE building, including at a van in a gated entryway. The detainees were in the van. No ICE personnel were wounded.

The shooter was identified as 29-year-old Joshua Jahn by a law enforcement official who could not publicly disclose details of the investigation and spoke to The Associated Press on condition of anonymity. Investigators had not determined the assailant’s motive.

FBI Director K

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