(DALLAS) — The man suspected of the shooting at a Dallas Immigration and Customs Enforcement field office on Wednesday opened fire “indiscriminately” from a nearby rooftop, killing one detainee and wounding two others in a van, authorities said.

The shooting suspect was identified as 29-year-old Joshua Jahn, multiple law enforcement sources told ABC News.

Authorities said he took his own life.

Here’s what we know about the suspect.

Suspect allegedly left behind note about ICE

FBI Director Kash Patel posed that Jahn allegedly left a handwritten note that read, “Hopefully this will give ICE agents real terror, to think, ‘is there a sniper with AP rounds on that roof?” — referring to armor-piercing bullets.

Patel also said “further accumulated evidence to this point indicates a

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