(CNN) — When people arrived at an Immigration and Customs Enforcement facility in Dallas early Wednesday morning for routine appointments, they were instead thrust into chaos as an ordinary day turned into a life-threatening nightmare.

Sharp cracks of gunfire pierced the morning air, loud, jarring pangs that echoed off the concrete. Inside the building, officials shouted warnings: a sniper was firing.

From the rooftop of a nearby building, the gunman, later identified as Joshua Jahn, was unleashing bullets, targeting the facility.

The shooting began at about 6:30 a.m. and bullets “sprayed the length of the building, the windows and law enforcement vans that were in the sally port area,” of the ICE facility, Nancy Larson, acting US attorney for the Northern District of Texas, said. Sally

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