Dallas ICE shooting

The notes say he was targeting immigration agents and wanted to cause terror, according to the U.S. Justice Department.

One detainee was killed and two others injured in the shooting. Though federal officials are investigating it as an "anti-ICE" attack, many migrants and immigration advocates are worried they'll be further targeted because of it.

Jahn grew up in North Texas, according to public records. He's been identified as the person who opened fire outside an ICE field office in Dallas Wednesday.

Wednesday's fatal shooting at a U.S. Immigration and Customs Enforcement field office in Dallas is at least the third instance of immigration enforcement-related violence in Texas this year.

The shooter is also dead from a self-inflicted gunshot wound. The director of U.S. Immigration and Customs Enforcement characterized the shooting as a political attack against law enforcement, though no ICE agents were injured in the shooting.