(NewsNation) — New surveillance video obtained by NewsNation shows chaos and panic at an Immigration and Customs Enforcement center in Dallas as a gunman shot three detainees.

One detainee was killed and two others were critically injured after the shooter, identified by officials as 29-year-old Joshua Jahn, opened fire on detainees and agents outside the building.

Part of the surveillance video shows two vans parked outside the facility. People are seen ducking for cover as they run between the vans toward the building.

Footage from a second camera captured detainees' panicked looks in the building as they ran inside for cover. A man is seen directing them toward the back of the building before officers clad in protective gear and carrying guns head back outside.

Jahn was found dead o

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