As I walked home the police were breaking up a march, people who had been at the courthouse (I gathered at a vigil) in support of Oscar Grant marched peacefully from there when they were told this. Several people have been arrested, that I saw, one thrown to the ground and his head held down against the sidewalk with a knee, though they were just walking on sidewalks and then standing with signs in a parking lot.
More updates as/if things happen, as this is once again outside my door. Organized protests planned for the 6th, though I wouldn't be surprised if they happened sooner now.