A sniper opened fire on the Dallas Immigration and Customs Enforcement field office on Wednesday morning, killing one detainee and critically wounding two other detainees, the Department of Homeland Security said.

DHS previously said two detainees were killed and one was injured; the agency later issued a correction saying one died and two were shot but survived.

One of the wounded is a Mexican national, according to Mexico's Ministry of Foreign Affairs.

Although only detainees were shot, the Department of Homeland Security called the shooting "an attack on ICE law enforcement."

The shooter, who was on a nearby rooftop, "fired indiscriminately at the ICE building, including at a van in the sallyport where the victims were shot," DHS said in a statement.

The shooter died from a self-in

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