Oakland police said 31 people were arrested at the port.
The bus was not able to leave until Oakland police arrived to provide an escort.
The Oakland police plan to warn the top 100 "persons of interest" in the city.
But the Oakland police said no one would be allowed to sleep there anymore, and promised to clear a second camp nearby.
Oakland police charged a man unrelated to the bakery with the murder.
Follow live updates as Oakland police are expected to make a statement on this week's clashes.
Mind you there appears to be a bit of that sort of denial with the Oakland police.
Oakland police estimated that as of April they had interacted with over 60,000 protesters since the movement began.
For entertainment, he spends hours in his van following the activities of the Oakland police on a shortwave radio.
Even the state and Oakland police conceded late in the day that they could not account for the drivers of five trapped vehicles.