DALLAS, Tx — Investigators continue searching for a motive after a gunman opened fire on an Immigration and Customs Enforcement field office in Dallas Wednesday, killing one detainee and critically injuring two others in what the FBI describes as "targeted violence."

The 29-year-old shooter, identified by law enforcement officials as Joshua Jahn, died by suicide after the sniper-style attack from a nearby rooftop. No ICE officers were injured in the incident, though authorities believe they were the intended targets.

FBI Special Agent in Charge Joe Rothrock revealed that investigators found bullet casings near the shooter etched with anti-ICE messages. "Rounds that were found near the suspected shooter contain messages that are anti-ICE in nature," Rothrock said during a press briefing.

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