A gunman fired on a Dallas immigration field office from a nearby roof, killing one detainee and critically wounding two others, before killing himself. The Department of Homeland Security has called Wednesday morning's shooting an indiscriminate attack on U.S. Immigration and Customs Enforcement. Officials said the victims were inside a van outside the facility. Authorities found ammunition with anti-ICE messaging at the scene. The attack is the latest in a series of targeted killings in the U.S. Officials have not released the identities of the victims or shooter. But a law enforcement official told The Associated Press that the suspect is 29-year-old Joshua Jahn.