A gunman who wrote "ANTI-ICE" on an unused bullet has killed one detainee and wounded two others when he fired on a US Immigration and Customs Enforcement field office in Dallas from a nearby rooftop before taking his own life, officials say.

FBI Director Kash Patel posted a photo on X of what he said was the suspect's unused ammunition 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 entry way where the victims were shot.

The department initially said two victims were dead and

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