ST. PAUL (AP)Authorities arrested 18 people during a protest of the acquittal of a suburban Minneapolis police officer who shot and killed a black driver.

Minnesota State Police spokeswoman Lt. Tiffani Nielson said in a news release Saturday that officers began arresting protesters at 12:30 a.m. after issuing three warnings for them to get off of Interstate 94 in St. Paul.

She says those arrested were booked at Ramsey County Jail on charges including being a pedestrian on the busy freeway.

Protesters rallied outside the state Capitol on Friday night after a jury acquitted St. Anthony police officer Jeronimo Yanez of manslaughter and other charges in the fatal shooting last summer of Philando Castile during a traffic stop.

The protesters eventually left the Capitol and began marching through the streets, with hundreds splintering off and blocking the freeway for about two hours.