The police was ready to control any demonstrations that got out of hand.
"We will have a low tolerance for violence and other types of actions. We intend to respond forcefully and early," county police commissioner Carin Götland said on Monday.
The political persuasions of the demonstrators varied, including the leftist group Action Against Deportation and the Pirate Party, Sweden's newest addition to the EU parliament.
According to the police, all demonstrations were conducted in a calm and controlled fashion.