The gunman who fatally shot an immigrant and injured two others at an Immigration and Customs Enforcement facility in Dallas left behind notes that outlined a plan to target ICE officers, federal law enforcement officials said on Thursday.

Nancy Larson, acting U.S. attorney for the Northern District of Texas, said that the gunman, who authorities identified as 29-year-old Joshua Jahn of Fairview, in Collin County, wrote that he hated the federal government and wanted to terrorize ICE agents, who he described as “human traffickers.”

The gunman’s notes showed that he wanted ICE agents to feel “real terror of being gunned down,” Larson said, calling his actions the “very definition of terrorism.”

“It’s clear from these notes that he was targeting ICE agents and ICE personnel,” Larson said.

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