Minn. protests turn violent, injuring 21 officers
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About 100 protesters were arrested and 21 police officers were injured during protests in St. Paul, Minn., late Saturday and early Sunday in response to the police killing of Philando Castile during a traffic stop Wednesday. 

Protesters caused an hourslong shutdown of part of Interstate 94 — a major artery of the area — near downtown St. Paul late Saturday. 

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At around 10 p.m., police ordered protesters to leave the interstate for the 16th time, but the demonstrators refused, the Minneapolis Star Tribune reported

Police in riot gear responded with smoke bombs, tear gas and pepper spray to disperse the crowd and eventually began making arrests. 

Protesters threw “rocks, bottles, fireworks and bricks” at officers, police spokesman Steve Linders said, adding that the injuries were not considered serious. 

Mayor Chris Coleman called the violence "shameful," saying it doesn't honor anyone's memory ... including Philando Castile's." 

Castile, a school cafeteria worker, was shot and killed by a police officer in Falcon Heights, Minn., on Wednesday. The aftermath was live streamed on Facebook by his girlfriend. 

His death came just one day after Alton Sterling, a black man, was shot and killed by police in Baton Rouge, La.

On Thursday, five Dallas police officers were shot and killed by a sniper at a protest of the two deaths.