By Chris Bradford,Richard Miller

Copyright thesun

COPS probing the shooting at an Immigration and Customs Enforcement field office are said to have made a chilling discovery in the sniper’s car.

Joshua Jahn, 29, is said to have opened fire “indiscriminately” in the horror that unfolded on Wednesday.

One detainee was left dead while two others were seriously injured.

Jahn then died from a self-inflicted gunshot wound.

Cops found anti-ICE messages on ammunition that was found near his body.

They also searched a Toyota Corolla car they think belonged to the shooter.

And, inside, they found a map showing areas of nuclear radiation fallout from tests carried out in the 1950s and 1960s.

The map, created by Richard Miller, shows areas crossed by two or more radioactive clouds.

Atmospheric nuclear weapon tests were carried out at a site – located around 65 miles north of Las Vegas – between 1951 and 1962.

The tests were carried out as the arms race with the Soviet Union ramped up.

The map found inside Jahn’s car was tattered, cops said.

Kash Patel, the FBI director, said the attack on the field office was “ideological.”

But, it appeared that Jahn’s interest in politics was limited.

He voted for the Democrats in the party’s 2020 primary in Texas, as reported by The New York Times.

And, Jahn used Reddit to talk about computer games, South Park, and marijuana.

“He wasn’t interested in politics on either side as far as I knew,” Jahn’s brother, Noah, told NBC News.

The U.S. Sun reported how Jahn’s mother had slammed Texas politicians online about gun laws.

In one post, she appeared to blame top GOP senator Ted Cruz and Governor Greg Abbott for the Uvalde massacre that left 21 dead.

The 2022 school shooting remains one of the deadliest in US history.

And, in another, she criticized Abbott after he welcomed an endorsement from the National Rifle Association.

Witnesses have spoken about the chaos that unfolded after Jahn opened fire from the roof.

He was stationed on the roof of an adjacent building when he opened fire at the field office.

One mom, known only as Sierra, told NBC she heard around 20 shots in a row.

Denises Robleto was sitting in her car waiting for her mother, who was in an appointment, when shots rang out.

“I thought of my mom, who was inside, and I didn’t know where the shots were coming from,” she told CBS News.

“My legs started shaking. My hands.”

The victims have not yet been identified, but it has been reported that one of those who were wounded was a Mexican national.

Kristi Noem, Trump’s Homeland Security chief, revealed more ICE officers would be hired in light of the shooting.

“We’re not going to stand for this in the United States,” she told Fox News star Laura Ingraham.