Anthony Kazmierczak faces federal assault charges after he appeared to spray the congresswoman with liquid from a syringe

The Department of Justice has filed federal charges against the man accused of attacking Democratic congresswoman Ilhan Omar at a town hall in Minneapolis on Tuesday. In newly filed court documents, a close associate told investigators that the alleged attacker previously said that “someone should kill” the Minnesota lawmaker.

Local police arrested and booked Anthony James Kazmierczak, 55, for third degree assault after he appeared to spray Omar with an acidic-smelling liquid from a syringe as she addressed constituents from a lectern.

In a criminal complaint, filed on Wednesday, the justice department charged Kazmierczak with a single count, alleging he “forcibly assaulted, opposed, impeded, intimidated, and interfered” with Omar – a crime that carries up to a year in prison.

In an attached affidavit signed by an FBI special agent, a forensic team determined that the substance sprayed at Omar was a mixture of “water and apple cider vinegar”. Also included are pictures of the syringe that Kazmierczak is accused of using to assault the congresswoman. The agent said the liquid “stained” Omar’s clothes and “may have reached her face and right eye”.