On 19 July, with an attack in via D'Amelio, in Palermo, Paolo Borsellino was killed. The attack was claimed again with the tag "Falange Armata". According to the prosecutor Nino di Matteo, the murder of Borsellino was executed in order to "protect the negotiation from the danger that judge Borsellino, become aware about it, revealed it and denounced publicly its existence, and so compromise irreversibly the desired result". From the place of the massacre Borsellino's red notebook, in which the magistrate annotated all his investigative intuitions and never separated from it, was not found. After the via D'Amelio bombing, the decree "Scotti-Martelli" was converted in law and over 100 particularly dangerous mafiosi inmates were transferred to Asinara prison and Pianosa prison, where they were submitted to the 41-bis regime that was applied even to other 400 mafiosi inmates.