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 ladder on his car, which they believe he used to climb onto the roof.

FBI Special Agent in Charge Joseph Rothrock speaks at a press conference on the Dallas ICE attack Sept. 25, 2025. (FOX)

FBI Special Agent in Charge Joseph Rothrock said Jahn conducted a “high degree” of pre-attack planning, which included tracking ICE agents and searching for information about the office building.

He said Jahn acknowledged in his notes the potential for other casualties, knowing detainees were likely to be transported that morning.

“Jahn’s attack did, in fact, result in the tragic death of one detainee and the injury to two other detainees,” Rothrock reiterated. “We have been able to confirm that Jahn legally obtained an 8 mm bolt-action rifle he used in the shooting in August of this year.”

Officials confirmed multiple shots were fired but declined to specify how many, citing the ongoing investigation. Authorities also withheld the victims’ identities, saying notifications and cooperation with families are ongoing.