Two young men were arrested in Kalamaria, Thessaloniki, while placing an explosive device in the apartment building where former minister Dimitris Stamatis lives.
New car arson occurred in the early morning in three areas of Attica.
Clashes took place between anarchists and anti-riot police in the afternoon at Patision, outside the Economic University.
A few minutes after five in the afternoon, the police forces blocked the anarchists near the entrance of the university and then stormed the courtyard of the University of Economics.
It all started when a group of anarchists set up barricades outside the university and blocked traffic.