Twenty-one officers from various Minnesota law enforcement agencies were injured and more than 102 protestors were arrested as a demonstration on the I-94 freeway in St. Paul turned violent Saturday night, with protestors hurling rocks, bottles, fireworks and bricks at law enforcement officers on the scene. Hundreds of demonstrators began protesting at the Governor’s Residence in St. Paul Saturday night over the police-involved shooting death of Philando Castile earlier in the week before heading onto the I-94 freeway around 8 p.m., local Fox affiliate KMSP reported. The interstate was shut down in both directions for more than five hours and...