Violent clashes are breaking out as Chileans mark the 41st anniversary of their own 9-11.

The 1973 military coup toppled Socialist President Salvador Allende and began the 17-year dictatorship of Gen. Augusto Pinochet.

Officials reported Thursday that vandals clashed with police overnight, throwing rocks and gasoline bombs and setting up flaming barricades.

At least one public bus was also torched. Police arrested seven people and said at least one officer was injured.

The anniversary of the coup is often marked by violence.