The assassination attempt occurred during the wedding parade held at the end of the religious ceremony of the Hieronymites, as the king was returning to the Royal Palace in the middle of a large crowd.
The Catalan anarchist Mateu Morral, inspired by the anarchist movement in Spain, threw a homemade bomb, disguised in a bouquet of flowers, from the top floor of the building at Calle Mayor number 84, where the popular tavern Casa Ciriaco is located.