Carabinieri on Tuesday arrested two sons of Matteo Messina Denaro's driver as the authorities continue to target the network that helped the late Cosa Nostra boss during his 30 years as a fugitive to Italian justice.
The arrested men are Antonino Luppino and Vincenzo Luppino, the sons of Campobello di Mazara entrepreneur Giovanni Luppino, who also acted as the mafia boss's driver and ended up in handcuffs with him when he was arrested on January 16 last year.
They are charged with aggravated aiding and abetting of crime and failure to comply with a sentence.
Messina Denaro was caught while leaving a clinic where he was being treated for cancer in Palermo.
He died in a hospital in L'Aquila on September 25 aged 62.
Messina Denaro had been convicted for his involvement in dozens of murders, including the 1992 Cosa Nostra bombings that killed anti-Mafia magistrates Giovanni Falcone and Paolo Borsellino.
In addition to the Falcone and Borsellino assassinations, he was convicted of the killing of Giuseppe Di Matteo, the 12-year-old son of a mobster-turned-State witness who was strangled and dissolved in acid in 1996, and bombings at art and religious sites in Milan, Florence and Rome that killed 10 people and hurt 40 more in 1993.