(CNN) — The shooter believed to be responsible for killing two detainees and injuring a third at a Dallas ICE facility is Joshua Jahn, according to three sources familiar with the case.

Jahn was 29, one source briefed on the investigation told CNN.

Authorities have said the shooter was found dead at the scene.

Wednesday’s shooting was at least the fourth instance of violence or a threat at an Immigration and Customs Enforcement or Customs and Border Protection facility in Texas this year.

One of those instances involved an August bomb threat at the same Dallas facility where Wednesday’s shooting happened, authorities have said.

Two ICE detainees were killed in Wednesday’s shooting, and another was hospitalized in serious condition, Homeland Security spokesperson Tricia McLaughlin t

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