Dozens of people in Oakland, California, protesting the Ferguson grand jury decision have gotten around police and are blocking traffic on a major highway in the Bay Area.

Television images show people milling around cars, raising their hands in the air, and holding signs on Interstate 580. Officers in cars and on motorcycles are trying to corral the protesters, and others are standing in a line to keep more people from getting on the highway.

The demonstration in Oakland is just one of the rallies taking place in several U.S. cities after a grand jury decided not to indict a white police officer who killed a black 18-year-old in Ferguson, Missouri.

Officials in the majority of the cities, including Chicago, Los Angeles, New York and Seattle, say the protests have been large and loud but mainly peaceful.

(AP)