Bullets fired from a weapon involved in a deadly shooting at the Dallas Immigration and Customs Enforcement (ICE) field office contained language against ICE, as revealed by the FBI on Wednesday.

Investigators have identified Joshua Jahn, 29, of Collin County, Texas, as the shooter. FBI officials said the shooter died by suicide.

Officials from the Department of Homeland Security reported that three detainees at the site were shot, with one of them being fatally injured. DHS Assistant Secretary Tricia McLaughlin mentioned that the shooter fired “indiscriminately” at the office from a nearby rooftop.

FBI Director Kash Patel included a photo of the bullet casings found at the scene, one of which had “anti-ICE” written on it in blue ink.

“These vile, politically motivated attacks directed at law enforcement are not isolated incidents,” Patel commented on X. “We are only a short distance from Prarieland, Texas, where an individual recently attacked another ICE facility, aimed at their officers. This must stop, and the FBI, along with our partners, will spearhead the investigation to ensure those targeting our law enforcement are fully prosecuted.”

Joseph Rothrock, the head of the FBI’s Dallas field office, stated that the agency is looking into the shooting as an act of intentional violence. He confirmed that no law enforcement personnel were harmed during the incident.

Vice President JD Vance, in a conversation with Nexstar Washington Correspondent Reshad Hudson, described Wednesday’s shooting as a “politically-motivated left-wing attack.”

“This incident reflects a worrying trend in our country, particularly in recent weeks,” Vance said. “I would encourage everyone to ease the aggressive language, especially when it pertains to our law enforcement and ICE agents.”

Texas Sen. Ted Cruz, a Republican, said at the news conference that the shooting was the third in Texas directed at an ICE officer or Customs and Border Protection agent.

“Look, in America, we disagree. That’s fine, that’s the Democratic process. But your political opponents are not Nazis. We need to learn to work together without demonizing each other, without attacking each other,” Cruz said.

Sen. Cory Booker, D-N.J., called the shooting an “unacceptable act of violence” in a social media post.

“My heart is with the victims and their loved ones,” Booker wrote. “While we don’t know all of the details yet, what we can, and all should, agree on is that the vilification of any group of people endangers them. It makes them targets. And it must stop. We are at an inflection point in our history where we must put in the work to break down our divisions and see our shared humanity. We cannot choose the path of hatred and division.”

‘s Ali Bradley contributed reporting to this story