A gunman opened fire Wednesday morning on a U.S. Immigration and Customs Enforcement field office in Dallas, killing one detainee and critically wounding two others before taking his own life, officials confirmed.

The Department of Homeland Security called the incident an “indiscriminate” and “targeted attack” and said Secretary Kristi Noem has ordered increased security at ICE facilities nationwide.

The victims

According to DHS, the detainees were shot while inside a transport van parked in the facility’s sallyport. One was killed and two others were hospitalized in critical condition. Their names have not been released pending next-of-kin notification.

Mexico’s Foreign Affairs Ministry told the Associated Press that one of the injured was a Mexican national and said the consulate has

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