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The Acca, as it is known locally, is defying its environment.

Two were shot dead by suspected far-left militants outside MSI headquarters on Via Acca Larentia in Rome, while the third was killed by police in riots that followed the shooting.

No-one was ever prosecuted for the killings, which have become widely known as the "Acca Larentia massacre".

The leader of the centrist Azione party, Carlo Calenda, said that the Acca Larentia commemoration was an "unacceptable disgrace in a European democracy."

The images from the Acca Larentia commemoration went viral after they were shared by La Repubblica correspondent Paolo Berizzi, but events of this kind are not unusual in Italy.