Police in Sicily arrested 11 suspected mobsters they believe were helping Sicilian Mafia boss Matteo Messina Denaro evade capture and spread his orders to the rest of the criminal organization.

The suspects used coded language and hand-written notes to communicate with the highest-ranking Sicilian mob boss currently at large, police said in a statement.

Messina Denaro has been sought since 1993 for planting bombs that killed 10 people in Florence and Milan.