(NEXSTAR) – During an investigation of a shooting at a U.S. Immigration and Customs Enforcement facility in Dallas on Wednesday, authorities discovered an unused casing marked with the words “ANTI-ICE,” according to FBI Director Kash Patel.

Three individuals, including detainees, were shot at the ICE facility on Wednesday, in what officials suspect was a planned attack. Of the victims, two were hospitalized, but their conditions remain unknown. Sadly, a third person succumbed to injuries at the scene, as reported by Dallas police spokesperson Officer Jonathen E. Maner to the Associated Press.

The shooter was also dead from a self-inflicted gunshot wound.

Patel, sharing a photograph of the bullets on X, remarked that “Based on initial evidence review, the attack appears to have an ideological motive.” The investigation is still ongoing.

The rounds were found near the suspected shooter, said Joe Rothrock, special agent in charge of the Dallas field office, in a press conference.

None of those injured were law enforcement officers, Patel said.

Officials did not immediately release the identities of those hurt or killed, only saying “detainees were among the victims.”

Police received a call around 6:40 a.m. Wednesday to assist an officer on North Stemmons Freeway. The early investigation reveals that shots were fired at the government facility from a neighboring building.

This incident is the most recent targeted act of violence in the U.S., occurring just two weeks after conservative leader Charlie Kirk was fatally shot by a gunman with a rifle positioned on a rooftop.

The Associated Press contributed to this report.