A man sprayed an unknown substance on Democratic congresswoman Ilhan Omar before being tackled to the ground on Tuesday during a town hall she was hosting.

The incident occurred in Minneapolis, where tensions over federal immigration enforcement have come to a head after agents fatally shot an intensive care nurse and a mother of three this month.

The audience cheered as the man, who was wearing a black jacket and holding a syringe, was pinned down and his arms were tied behind his back. In video of the incident, someone in the crowd can be heard saying, “Oh my god, he sprayed something on her”.

Just before that Omar had called for the abolishment of US Immigration and Customs Enforcement and for Homeland Security Secretary Kristi Noem to resign.

“ICE cannot be reformed,” she said.