A gunman who killed one person and wounded two others at an Immigration and Customs Enforcement field office in Dallas before taking his own life wrote "ANTI-ICE" on one of his bullets.
FBI Director Kash Patel posted a photo on social media of what he said were the suspect's unspent shell casings that showed one with the words written along the side.
"While the investigation is ongoing, an initial review of the evidence shows an ideological motive behind this attack," Mr Patel wrote.
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. Officials did not offer any details about the suspect's identity.
FBI Director Kash Patel posted this image on social media of the bullet casings
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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.
Secretary of Homeland Security Kristi Noem wrote on X: "There was a shooting this morning at the Dallas Ice Detention Facility.
"Details are still emerging, but we can confirm there were multiple injuries and fatalities. The shooter is deceased by a self-inflicted gunshot wound."
High-ranking Dallas Police Department officials say no law enforcement officers were injured, but that three people were shot and two were killed.
Ms Noem added: "While we don't know the motive yet, we know that our Ice law enforcement is facing unprecedented violence against them. It must stop. Please pray for the victims and their families."
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Law enforcement personnel respond at the scene of a shooting at an Immigration and Customs Enforcement field office in Dallas
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A police officer on the phone at the scene
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The suspect opened fire on the office from an adjacent building around 6.40am local time 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 shooting 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.
Emergency services closed off roads around where the shooting happened
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"It looks like he could have been watching to look at the processing and see what happens on a day-to-day basis at this Dallas field office.
"But [these are] all answers that Homeland Security investigation is going to get down to the bottom of."
Senator Ted Cruz confirmed he is aware of the shooting and noted that his team are monitoring the situation.
Mr Cruz said: "My team and I are closely monitoring the situation at the Ice Detention Facility in Dallas.
Senator Ted Cruz listens as Dallas Mayor Eric Johnson speaks at a press conference
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"We are praying for the swift recovery of those injured, and we are deeply grateful to the brave first responders who rushed to the scene."
The shooter was found dead on the roof of a nearby building, local ABC affiliate WFAA reported, citing sources.
"Preliminary information is a possible sniper," ICE acting Director Todd Lyons told CNN.
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.