A gunman who wrote “ANTI-ICE” on an unused bullet killed two detainees and wounded another on Wednesday at an Immigration and Customs Enforcement field office in Dallas before taking their own life, officials said.

FBI Director Kash Patel posted a photo on X of what he said were the suspect’s unspent shell casings that showed one with the words “ANTI-ICE” written along the side.

“While the investigation is ongoing, an initial review of the evidence shows an ideological motive behind this attack,” Patel wrote.

In a statement, the Department of Homeland Security said the suspect fired “indiscriminately” at the ICE building, including at a van in the building’s secured entryway where the victims were shot.

At a news briefing in Dallas, officials disclosed the existence of the shell casings but emphasized that the investigation was still in its early stages. Authorities were treating the attack as an “act of targeted violence,” Joseph Rothrock, special agent-in-charge of the FBI’s Dallas field office, told reporters.

Officials did not offer any details about the suspect’s identity.

The shooter opened fire on the office from an adjacent building around 6:40 a.m. local time (1140 GMT), police said. Two people were transported to a hospital with gunshot wounds, while a third person died at the scene.

Law enforcement officers were not injured in the shooting, officials said. The attack took place at an ICE field office, not a detention facility, where ICE officers conduct short-term processing of recently-arrested detainees.

“It looked like it might have been a sniper or some sort of a long-form shot,” Tricia McLaughlin, a spokeswoman for the Department of Homeland Security, told Fox News’ “Fox & Friends” earlier on Wednesday.

Two Weeks After Charlie Kirk Assassination

The incident comes two weeks after the shooting death of conservative activist Charlie Kirk by a sniper during an event in Orem, Utah, which fueled fears of a new wave of political violence in the United States.

President Donald Trump, Vice President JD Vance and other administration officials have blamed, without proof, liberal organizations for fomenting unrest and encouraging violence against the right. On Monday, Trump signed an executive order declaring the anti-fascist movement antifa as a domestic “terrorist organization” despite the fact that there has been no evidence made public linking antifa to Kirk’s death.

The Trump administration’s aggressive use of ICE agents as part of its crackdown on undocumented immigrants has sparked outcries from Democrats and liberal activists. ICE detention facilities have increasingly become sites of conflict, with heavily armed agents deploying pepper ball guns, tear gas and other chemical agents in clashes with protesters.

An ICE facility in suburban Chicago, where protesters have gathered daily since a Trump administration immigration surge began earlier this month, erected fencing on Monday after several demonstrators, including the mayor of Evanston, Illinois, were injured in a clash with agents last week.

Wednesday’s attack was the third shooting this year in Texas at a Department of Homeland Security facility. A police officer was shot in a July incident at an ICE detention center in Prairieland, and a 27-year-old Michigan man was shot dead by agents after opening fire on a U.S. Border Patrol station in McAllen in July.

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(Reporting by Brendan O’Brien in Chicago and Rich McKay in Atlanta; Additional reporting by Ted Hesson, Ryan Patrick Jones, Susan Heavey, Andrew Goudsward, Kristina Cooke, Emily Schmall and Rami Ayyub; Writing by Joseph Ax and Jim Oliphant; Editing by Frank McGurty and Nick Zieminski)