DALLAS (NewsNation) — Federal investigators are searching for a motive after a deadly shooting on Wednesday at a U.S. Immigration and Customs Enforcement field office in Dallas left one detainee dead, two others critically injured, and the gunman dead.

One detainee at the facility was killed and pronounced dead at the scene, a Homeland Security spokesperson said. Two other detainees were critically injured. DHS said that the victims were shot in a transport van parked in the facility’s sallyport. No ICE personnel were injured.

NewsNation’s Ali Bradley confirmed through sources that the suspected shooter is 29-year-old Joshua Jahn from Collin County, Texas, north of Dallas, who reportedly died by suicide.

According to the Department of Homeland Security, Jahn opened fire from a rooftop a

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