DALLAS () Federal investigators are searching for a motive after a deadly shooting on Wednesday at a U.S. Immigration and Customs Enforcement field office in Dallas left one detainee dead, two others critically injured, and the gunman dead.

One detainee at the facility was killed and pronounced dead at the scene, a Homeland Security spokesperson said. Two other detainees were critically injured. DHS said that the victims were shot in a transport van parked in the facility’s sallyport. No ICE personnel were injured.

Sources confirmed to that the suspected shooter is 29-year-old Joshua Jahn from Collin County, Texas, north of Dallas, who reportedly died by suicide.

According to the Department of Homeland Security, Jahn opened fire from a rooftop about 450 feet away. Officials said Jahn was firing “indiscriminately,” and bullets hit both the ICE office and van as detainees were being processed for transfer.

FBI Director Kash Patel posted a photo on social media showing a bullet recovered at the scene with “ANTI-ICE” written on it.

FBI investigates shooting as a targeted act

Homeland Security Secretary Kristi Noem ordered more security at ICE facilities across the U.S., according to a post by the DHS on social media.

Authorities say the ICE field office was riddled with bullet holes, with one round piercing an American flag on display. The FBI said it was investigating the shooting as “an act of targeted violence.”

Officials have not yet released the names of the victims. Jahn, who had a criminal record including drug-related charges, used a bolt-action rifle in the attack, according to a law enforcement official who spoke on condition of anonymity to the Associated Press.

Lawmakers call for an end to political violence

The shooting marks the third incident targeting an ICE facility in Texas since July.

Lawmakers from both parties condemned the violence and emphasized the importance of maintaining civil discourse.

“It is a punch in the gut because time and time again, we are seeing more and more of this violence,” said Rep. Tony Gonzales, R-Texas. “ICE agents are just doing their job — they are not making policy, they are implementing policy. Whether you agree with it or not; they are not the ones who should be to blame.”

Texas Rep. Nicole Collier, D-Fort Worth, cautioned against rushing to conclusions.

“When we are talking about what happened, we don’t know what happened, and so to try and place blame is premature,” she said.

President Donald Trump weighed in on Truth Social, writing, “The brave men and women of ICE are just trying to do their jobs and remove the ‘worst of the worst’ criminals from our country, but they are facing an unprecedented increase in threats, violence, and attacks by deranged radical leftists.”