Mobile applications that track Immigration and Customs Enforcement agents have come under federal scrutiny after a deadly shooting at a Dallas ICE facility, with law enforcement officials linking the attacker’s use of such apps to the violence.

Joshua Jahn, who killed one detainee and wounded two others before taking his own life at the Dallas facility, had searched for ICE tracking apps in the days leading up to the shooting and downloaded documents listing Department of Homeland Security facilities, according to federal investigators.

In writings, Jahn stated he wanted to “cause real terror among agents,” officials said.

“The shooter used the ICE tracking apps,” said Marcos Charles, ICE Enforcement and Removal Operations field office director. “Anyone who creates or distributes these apps that is designed to spot, track and locate ICE officers are well aware of the dangers that they are exposing to law enforcement.”

Shooter used apps before killing detainee, wounding two others

Charles compared the apps to “giving a hitman the location of their intended target.”

Several apps alert users to ICE agent presence in their areas, emerging as the Trump administration has intensified immigration enforcement. 

The most prominent, ICEBlock, describes itself as an early warning system modeled after the traffic app Waze. Users can anonymously report ICE agent locations within a five-mile radius with two phone taps, and data is purged every four hours. The app claims 1.1 million active users as of this month.

ICEBlock app has 1.1M users, reports agent locations anonymously

ICEBlock creator Joshua Aaron says the app “empowers communities to stay informed about ICE presence.” His social media profile describes him as “proud #ANTIFA” and advocates “#RESIST BY ANY MEANS NECESSARY.”

White House press secretary Karoline Leavitt in June condemned such apps, calling them potential incitement to violence against ICE officers. She cited a 500% increase in violence against ICE agents nationwide.

“This sure looks like obstruction of justice,” said DHS Assistant Secretary Tricia McLaughlin. “If you obstruct or assault our law enforcement, we will hunt you down and you will be prosecuted to the fullest extent of the law.”

The apps remain available for download on major platforms, including Apple’s App Store, despite such concerns.