ATLANTA (AP) — Protests took a violent turn in several U.S. cities over the weekend, with demonstrators squaring off against federal agents outside a courthouse in Portland, Oregon, and forcing police in Seattle to retreat into a station house.

Vehicles were set ablaze Saturday night or early Sunday in California and Richmond, Virginia.

And a protester who was allegedly armed with a rifle was shot and killed during an anti-police violence protest in Austin, Texas, after a witness says he approached a car that had driven through the demonstration and the driver shot him. Authorities say someone was shot and wounded in Aurora, Colorado, after a car drove through a protest there.

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