The Latest: 18 arrested protesting Minnesota cop's acquittal

Demonstrators hold signs as they as they block traffic on Interstate 94 in St. Paul, Minn., after leaving a vigil at the state Capitol

Marchers walk along Interstate 94 on Friday night, June 16, 2017, in St. Paul, Minn., after a vigil at the state Capital. A Minnesota p

Supporters of Philando Castile hold a portrait of Castile as they march along University Avenue in St. Paul, Minn., leaving a vigil at

Protesters leave the steps of the state Capitol after a rally in St. Paul, Minn., Friday, June 16, 2017. A Minnesota police officer was

Valerie Castile, mother of Philando Castile, points to the sky during a news conference outside the Ramsey County Courthouse in St. Pau

St. Paul, Minn., police stand by after issuing a warning to disperse to demonstrators, Friday night, June 16, 2017 Supporters of Philan

John Thompson, a friend of Philando Castile, cries as he embraces two supporters on the steps of the state Capitol in St. Paul, Minn.,

ST. PAUL, Minn. (AP) — The Latest on the acquittal of a Minnesota police officer who shot and killed a black driver (all times local):

8:20 a.m.

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.

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12:50 a.m.

The world learned of Philando Castile's death through a Facebook livestream launched by his girlfriend seconds after he was shot by a Minnesota police officer.

But no video existed of exactly what happened inside the car. That left a jury to decide whether they believed Officer Jeronimo Yanez on the witness stand, and they opted Friday to acquit the officer.

Yanez testified that Castile, a school cafeteria worker, was reaching for his gun despite his commands not to pull it out. And Yanez said he feared for his life.

Friday's acquittal prompted swearing from Castile's family members. Valerie Castile said her son was murdered.

Juror Dennis Ploussard says most jurors voted for acquittal early on. Two holdouts eventually agreed after five days. He says the jury sympathizes with Castile's family.