DALLAS -- Three detainees were shot at the Dallas Immigration and Customs Enforcement field office on Wednesday morning, law enforcement sources told ABC News, with the FBI saying the shooting is being investigated "as an act of targeted violence."

One victim was killed and two were wounded, authorities said.

At a news conference, authorities would not confirm whether the victims were detainees, but they repeatedly said that no law enforcement officers were hurt.

Multiple fatalities were reported in a shooting at the Dallas Immigration and Customs Enforcement field office on Wednesday morning

The shooter -- who appeared "to be a sniper from an elevated position" firing from "a couple hundred yards" away -- died from a self-inflicted gunshot wound, acting ICE Director Todd Lyons told A

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