BENGHAZI, Libya — Doctors Without Borders has suspended its work in prisons in the Libyan city of Misrata because it said torture was so rampant that some detainees were brought for care only to make them fit for further interrogation, the group said Thursday.

The announcement was compounded by a statement from Amnesty International saying it has recorded widespread prisoner abuse in other cities as well, leading to the death of several inmates.

The allegations, which come more than three months after former leader Moammar Gadhafi was captured and killed, were an embarrassment to the governing National Transitional Council, which is struggling to establish its authority in the divided nation.

Doctors Without Borders said that since August, its medical teams have treated 115 people in Misrata who bore torture-related wounds, including cigarette burns, heavy bruising, bone fractures, tissue burns from electric shocks and kidney failure from beatings. Two detainees died after being interrogated, the group’s general director said.

“Patients were brought to us in the middle of interrogation for medical care, in order to make them fit for further interrogation. This is unacceptable,” MSF general director Christopher Stokes said in a statement. “Our role is to provide medical care to war casualties and sick detainees, not to repeatedly treat the same patients between torture sessions.”