Some U.S. Immigration and Customs Enforcement facilities are heavily secured, closed off behind metal fences, hardened doors and armed guards. Many are in federal buildings built with a focus on security. Detainees are often moved in and out of buildings through underground parking garages.

And in other cases, the outer perimeter is little more than a chain-link fence topped with a few strands of barbed wire.

That’s the situation in Dallas, where authorities say a gunman opened fire Wednesday on an ICE office from a nearby rooftop, spraying bullets into a transport van, killing one detainee and critically injuring two more.

The gunman then took his own life, authorities said.

John Torres, a former acting director of the agency and former head of what is now called its Enforcement and R

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