JAKARTA - Indonesian authorities moved inmate Abu Bakar Ba'asyir, the radical cleric and alleged mastermind of the Bali bombings, to a high security prison near Jakarta on Saturday, a government official said, amid security concerns.

Ba'asyir, the spiritual leader of the Islamist group Jemaah Islamiah (JI) and its offshoots, was jailed for 15 years in 2011 following years of efforts to obtain a long sentence for the preacher seen as inciting hatred in his speeches. Authorities have raised concerns about the cleric's continuing influence in radical networks.

Ba'asyir was moved ‘according to schedule’ to the Gunung Sindur maximum security prison in Bogor from the Nusakambangan prison in Central Java, Agus Barnas, a spokesman for the coordinating ministry of security affairs, told Reuters by text message. The transfer is an indication the govt is taking more seriously the management of prisons - a breeding ground for militants - after January's Jakarta attackers were found to have been influenced by prominent inmates.

The gun and suicide attack in Jakarta in January highlighted concerns that in Indonesia's prison system staff shortages, overcrowding and corruption have allowed extremists to mingle and disseminate sermons by email, Facebook and telephone. ‘In the past, this rule was not enforced,’ Barnas said, adding that previously Ba'asyir had ‘freely spread radical teachings, through sermons or by cellphone.’