It claimed to have seen patients in Tripoli, Misrata and Gheryan with open wounds to their head, limbs and back.

Meanwhile, charity Medecins Sans Frontieres has suspended operations in Misrata after treating 115 patients with torture-related wounds.

The UN says it is concerned about the conditions in which patients are held.

"The torture is being carried out by officially recognised military and security entities as well as by a multitude of armed militias operating outside any legal framework," a spokesman for London-based Amnesty said.

ბbc.com