Italy’s No. 1 fugitive, convicted Mafia boss Matteo Messina Denaro, was arrested on Monday at a private clinic in Palermo, Sicily, after 30 years on the run, Italian paramilitary police said.

Messina Denaro was captured at the clinic where he was receiving treatment for an undisclosed medical condition, said Carabinieri Gen. Pasquale Angelosanto, who heads the police force’s special operations squad.