(CNN) — The mayor of Evanston, Illinois , says he is opening two investigations after federal agents were filmed pinning down and repeatedly striking a person in the head as they arrested him Friday.

Videos shared on social media showed federal agents pinning a man to the ground and punching him in the head. In a statement, the Department of Homeland Security said the agents were conducting an immigration enforcement operation at the time. It said agents had observed a “red vehicle” that was “aggressively” tailing their vehicle, and when the agents turned, the car crashed into Border Patrol. DHS said a “hostile crowd” gathered around their vehicle and began “verbally abusing them and spitting on them.”

But Mayor Daniel Biss disputed the agency’s account of the incident in an interview

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