Massachusetts State Police arrested 29 people who stopped traffic on two sections of a major highway into Boston during the morning rush hour Thursday to protest the recent killings by U.S. police of unarmed black men. Protesters chained themselves to concrete barrels on the roadway. In a statement, organizer Katie Seitz said, “Our nonviolent direct action is meant to expose the reality that Boston is a city where white commuters and students use the city and leave, while black and brown communities are targeted by police, exploited and displaced.”