Joshua Jahn, a 29-year-old Collin County college dropout, is suspected of opening fire at the Dallas ICE office early Wednesday, killing a detainee

Joseph Rothrock, special agent in charge of the Dallas FBI field office, described the "significant, high-degree of pre-attack planning" that preceded the deadly shooting. Rothrock said Jahn searched for information about the ICE facility and how to track the location of ICE agents.

U.S. Immigration and Customs Enforcement facilities in Florida will see an increased law enforcement presence.

Administration officials repeatedly argue political opponents are fueling surge in threats against federal agents

Authorities are investigating whether today’s shooter opened fire from a rooftop, as Kirk’s alleged killer is believed to have done. A man who shot at Mr Trump at a rally in Butler, Pennsylvania, last year, also shot from a rooftop. ICE has also been a focal point for anger among Mr Trump’s opponents who object to his massive deportation push.

MAGA Republicans have jumped to blame Democrats for a fatal shooting at a Texas ICE facility that killed one person and injured at least two more. Federal authorities say detainees were among the victims and no federal agents had been shot.