A lawyer for the spiritual leader of the militants who carried out the 2002 Bali bombings is urging Indonesian authorities to end his "inhumane" treatment in prison.

The radical Islamic cleric Abu Bakar Bashir has been confined to a tiny isolation cell in the wake of the Jan. 14 suicide bombings in the Indonesian capital Jakarta.

Authorities say the measure is needed to prevent him from radicalizing other prisoners and to cut him off from extremist networks.

Lawyer Mohammad Mahendradatta said Thursday that the condition of the 77-year-old's 2 square meter (22 square foot) cell is "simply shocking and inhumane treatment against him is causing his health to deteriorate."

A spokesman for Indonesia's prisons department said Bashir is in good health and receiving appropriate facilities for an isolation prisoner.