The shooter — who appeared “to be a sniper from an elevated position” firing from “a couple hundred yards” away — died from a self-inflicted gunshot wound, Lyons said. Dallas police said it appears the shooter fired from an adjacent building.

Officers exchanged fire with the shooter, according to Lyons said, who added that “all ICE agents and officers at [the] location are accounted for.”

This is the second ICE facility in Texas to come under attack — referring to the July attack on the Prarieland Detention Center in Alvarado, Texas — and Lyons said he would put all ICE facilities on a higher alert to protect agents and civilians carrying out the agency’s mission.