Washington — The Immigration and Customs Enforcement field office where a gunman opened fire on Wednesday was also the target of an alleged bomb threat in August, underscoring a pattern of attacks and threats targeting federal facilities and officials in recent months.

On Wednesday, ICE said in a statement that a gunman began firing "indiscriminately" at the field office and its entryway early in the morning, killing two people and wounding a third. No ICE officials were injured, and the gunman died of a self-inflicted gunshot, according to the agency.

Joe Rothrock, the special agent in charge of the FBI's Dallas office, said the bureau was investigating the shooting as an "act of targeted violence."

"Early evidence that we've seen from rounds that were found near the suspected

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