The gunman who opened fire on an Immigration and Customs Enforcement (ICE) facility in Dallas hated the U.S. Government and wanted to incite terror by killing federal agents, officials said Thursday (September 25, 2025), a day after the attack that killed a detainee and critically wounded two others.The gunman, who fatally shot himself, also left behind a note saying that he hoped the attack would “give ICE agents real terror,” the FBI director said Thursday (September 25, 2025).The post by Kash Patel on the social platform X offered the first hint of a motive behind the shooting on Wednesday (September 24, 2025) that targeted the ICE building, including a van in a gated entryway. The detainees were in the van. No ICE personnel were wounded.The assailant, who authorities said fired indiscriminately from a nearby rooftop, was involved in a “high degree of pre-attack planning,” Mr. Patel said, and agents have seized electronic devices, handwritten notes and other evidence from a Dallas-area home.“One of the handwritten notes recovered read, 'Hopefully this will give ICE agents real terror, to think, is there a sniper with AP rounds on that roof?'” Mr. Patel wrote, quoting an apparent abbreviation for armour-piercing bullets.The gunman had also downloaded a document titled “Dallas County Office of Homeland Security & Emergency Management” containing a list of Homeland Security facilities, Mr. Patel said.Hours before the shooting, the assailant conducted multiple internet searches for ballistics information and video of the assassination of conservative activist Charlie Kirk on a Utah university campus this month, Mr. Patel said. Last month, the man searched for apps that tracked the presence of ICE agents, he added.Joshua Jahn, 29, was identified as the shooter by a law enforcement official who could not publicly disclose details of the investigation and spoke to The Associated Press on condition of anonymity.