The substance an attacker sprayed on Rep. Ilhan Omar (D-Minn.) during a Minneapolis town hall on Tuesday was found to be apple cider vinegar.

Forensic scientists made the determination “with high probability,” CNN wrote, citing a law enforcement source. The progressive lawmaker’s office later confirmed the discovery to the news network.

Omar was referring to tension that has arisen since federal immigration agents shot and killed two protesters when the suspect, identified as Anthony J. Kazmierczak, sprayed her with liquid with a syringe, The News reported.

He was pinned to the ground, arrested and booked into the county jail for third-degree assault. Undeterred, Omar spoke for 25 more minutes, PBS reported.

The suspect expressed support for President Donald Trump online and called Democrats “angry and liars,” according to the public broadcaster.

Ilhan Omar, photographed at a news conference Monday, was doused with apple cider vinegar in a recent attack, forensic specialists determined.
Ilhan Omar, photographed at a news conference Monday, was doused with apple cider vinegar in a recent attack, forensic specialists determined.

Bloomberg via Getty Images

Before the attack, Omar had called for the abolition of Immigration and Customs Enforcement and the resignation or impeachment of Homeland Security Secretary Kristi Noem.

The congresswoman wrote of the incident on social media: “I’m fine. I’m a survivor so this little firebrand isn’t going to bully me into not doing my job. I don’t let the bullies win. Grateful to my amazing constituents who stood up for me. Strong Minnesota.”

Omar blamed Trump’s inflammatory rhetoric for the threats against her and said he had “dementia” and is “obsessed” with it.