The investigations reconstructed the execution of the Via Palestro massacre on the basis of statements made by the
pentiti Pietro Carra, Antonio Scarano, Emanuele Di Natale and Umberto Maniscalco: in 1998 Cosimo Lo Nigro, Giuseppe Barranca, Francesco Giuliano,
Gaspare Spatuzza, Luigi Giacalone, Salvatore Benigno, Antonio Scarano, Antonino Mangano and Salvatore Grigoli were recognized as material performers of the massacre in the 1993 judgment; However, in the same judgment, it reads: "[...]
Unfortunately, the failure to identify the basis of operations in Milan and the subjects who in this city certainly had logistical support and manual contribution to the massacre did not allow to penetrate those realities that, as evidenced by the investigation carried out in other events at the examination of this Court, have proved to be more promising in terms of external verification". In 2002, according to statements made by Carra and Scarano, the Prosecutor Office of
Florence ordered the arrest of the brothers Tommaso and Giovanni Formoso ("Men of Honor" of
Misilmeri), identified by investigations as those who helped Lo Nigro in the discharge of the explosive at Arluno and who physically carried out the Via Palestro massacre. In 2003, the tribunal of Milan condemned the Formoso brothers to life imprisonment, and this conviction was confirmed in the next two levels of judgment. In 2008, Gaspare Spatuzza began collaborating with justice and provided new declarations on the material performers of the Via Palestro massacre: in particular, Spatuzza reported that himself, Cosimo Lo Nigro, Francesco Giuliano, Giovanni Formoso, and the brothers Vittorio and Marcello Tutino (mafiosi of Brancaccio) attended a meeting where the groups that had to operate on Rome or Milan to carry out the attacks were decided; according to Spatuzza, Formoso and Tutino brothers operated on Milan and at first he, Lo Nigro and Giuliano, came to help them unload the explosive and the theft of the Fiat Uno used in the attack, and then returned to Rome in order to carry out the attacks to the churches. Spatuzza later also dismissed Tommaso Formoso, stating that only the brother Giovanni was involved in the attack, borrowing by Tommaso with an excuse the Arluno's chalet where the explosive was unloaded. However, in April 2012, the tribunal of
Brescia rejected the request for review of the trial to Tommaso Formoso, arguing that the only statements of Spatuzza were not sufficient. Also based on the statements of Spatuzza, in 2012 the Prosecutor Office of Florence ordered the arrest of the fisherman Cosimo D'Amato, cousin of Cosimo Lo Nigro, who was accused of having supplied the explosive, extracted from unexploded munitions recovered from the sea, which was used in all the attacks of 1992–93, including the Via Palestro massacre. In 2013, D'Amato was sentenced to life imprisonment by the tribunal of Florence. ==Commemorations==