At least one person has been killed and others remain critically injured after a shooting at a US Immigration and Customs Enforcement (ICE) facility in Dallas, Texas.

The Department of Homeland Security said the suspect fired "indiscriminately" at the ICE building, including at a van in the building's secured entryway where the victims were shot.

The shooter opened fire on the office from atop an adjacent building around 6.40am on Wednesday, local time, police said.

Sources close to the investigation told The New York Post and Fox News the suspected gunman has been identified as Joshua Jahn, 29.

The suspected shooter was later found dead on a rooftop from what appeared to be self-inflicted gunshot wounds, the FBI said.

FBI Director Kash Patel shared a picture of the bullets found at t

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