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AUSTIN (Nexstar) -- A deadly attack by a gunman on an Immigration and Customs Enforcement field office in Dallas is leading to calls to tone down heated political rhetoric.

The gunman acted alone. On Thursday, officials said the investigation showed the shooter hated the U.S. government and wanted to incite terror by killing federal agents, offering the first hint of a motive in the attack.

The shooting early Wednesday targeted the ICE building, including a van in a gated entryway that held detainees. One detainee was killed, and two other were critically wounded. No ICE personnel were hurt.

Investigators say the gunman fat

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