JAKARTA, Indonesia (AP) — A radical Islamic cleric who was the spiritual leader of the Bali bombers and a force behind a jihadist training camp raided in 2010 has been transferred from prison to a Jakarta hospital.

Guarded by four paramilitary police officers, the ailing Abu Bakar Bashir arrived at the hospital in Indonesia's capital on Thursday morning.

He was sentenced to 15 years in prison in 2011 for supporting a military-style training camp for militants that was uncovered the year before.

The octogenarian Bashir suffers from medical problems including chronically weak blood circulation.

Bashir was arrested almost immediately after the 2002 Bali bombings, but prosecutors were unable to prove a string of terrorism-related allegations. He was instead sentenced to 18 months prison for immigration violations.