A sniper critically wounded at least three people at an ICE facility in Dallas early Wednesday, authorities said.

Police were called to the US Immigration and Customs Enforcement office just before 7 a.m. local time (8 a.m. ET) to reports of shots being fired, law enforcement sources told WFAA .

A shooter was found dead on the roof of a nearby immigration attorney’s office, but it isn’t clear if others were involved in the attack.

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