(NewsNation) — 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 dis

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