Federal authorities have revealed chilling details following a sniper attack at an Immigration and Customs Enforcement (ICE) facility in Dallas, Texas.

According to officials, the shooter opened fire early Wednesday on the field office, targeting detainees inside. Three people were struck during the attack — two were pronounced dead at the scene, while a third remains hospitalized with injuries.

Investigators disclosed that the sniper had written a message directly on the bullets used in the attack, though the exact wording has not yet been released to the public. The discovery has raised questions about the shooter’s motives and whether the attack was politically or ideologically driven.

The FBI has taken the lead in the investigation and is working with local law enforcement to identify the gunman. Authorities are also reviewing surveillance footage and gathering forensic evidence from the scene.

The attack has heightened security concerns at federal facilities nationwide, as officials warn of potential copycat incidents.