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A gunman who meticulously planned an ambush on a Dallas Immigration and Customs Enforcement (ICE) facility killed 1 detainee and injured 2 others before taking his own life in what federal officials called an act of terrorism aimed at instilling fear in law enforcement.

Nancy Larson, acting U.S. attorney for the Northern District of Texas, told reporters Thursday that Wednesday’s shooting was the third violent attack or threat at ICE facilities during her four months in the role.

In the latest incident, she said 29-year-old Joshua Jahn opened fire from a rooftop before dying of a self-inflicted gunshot wound. Larson added he likely acted alone.

Investigators said video from around 3 a.m. showed Jahn driving with a large

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