IOWA CITY, Iowa (AP) — Authorities in Iowa City say a peaceful demonstration against police brutality turned violent late Tuesday when protesters broke windows at a county building and threw rocks and water bottles at officers. Protesters said that Johnson County sheriff’s deputies deployed pepper spray during the clash, which occurred before midnight near the Johnson County Health and Human Resources building.

Police arrested University of Iowa student Sevad Duratovic, saying he was seen “stepping away from a broken window carrying a baseball bat” and then swinging at the window of a nearby vehicle.Duratovic was tackled and handcuffed, and said he was hit in the eyes with pepper spray as he was walking to a police vehicle. He denies swinging the bat or breaking any windows.