The FBI is investigating a shooting at a Dallas Immigration and Customs Enforcement field office in which multiple people were shot and at least two people were killed early Wednesday morning as an act of “targeted violence.”

Three illegal immigrants in federal custody were shot in a sniper-style attack, in what authorities described as a shooting that appeared to have been aimed at ICE officers, not detainees. The suspect died from a self-inflicted wound, according to authorities.

Joseph Rothrock, special agent in charge of the FBI’s Dallas field office, told reporters late Wednesday morning that it was too early to specify the exact motive of the deceased shooter, but that early indicators suggested it was an attack on federal law enforcement.

“What I can also share with you is that early evidence that we’ve seen from rounds that were found near the suspected shooter indicate messages that are anti-ICE in nature,” Rothrock said. “I can confirm at this time that the FBI is investigating this incident as an act of targeted violence.”

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This story is developing and will be updated.