Joshua Jahn opened fire from a rooftop near a Dallas, Texas, Immigration and Customs Enforcement facility early Wednesday, killing two detainees and critically wounding a third before dying by suicide, according to federal investigators.

The 29-year-old gunman targeted an unmarked ICE transport van parked outside the North Stemmons Freeway facility around 6:30 A.M., officials said. Authorities reported Jahn unleashed a barrage of bullets at both the van and the sally port entrance before turning the weapon on himself as officers approached.

The FBI, now leading the case, is treating the incident as an ideologically motivated act of violence. Officials recovered shell casings at the scene engraved with the phrase “ANTI ICE.”

The victims were all ICE detainees being transported in the van. Two died at the scene. The third remains hospitalized in critical condition. No ICE agents were harmed. Jahn had no known violent criminal history, though a 2015 marijuana possession arrest was found in Collin County records. Authorities believe he may have been living in Durant, Oklahoma, and conducted a search of a family home in Fairview, Texas, after the shooting.