Thousands have been killed and half a million civilians forced to flee the fighting between troops loyal to President Salva Kiir and rebels allied to his sacked deputy Riek Machar.
The United Nations says atrocities have been committed by both sides, including mass killings, sexual violence and widespread destruction.
A report released today by South Sudan's presidency detailed devastation in the town of Bor while it was under rebel control, accusing the rebels of executing 127 patients in the hospital.
The government report could not be independently verified, but civilians in Bor have recounted to AFP grim stories of how the rebels gang-raped and murdered patients in the town's hospital.
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"Towns such as Malakal, Bor and Bentiu have been reduced to rubble, and there is nothing to salvage," presidential spokesman Ateny Wek Ateny said in a statement.
Stalled ceasefire talks in Ethiopia are being mediated by the East African regional bloc IGAD, with the two sides meeting face to face again today afternoon.
"More important than signing is the work we do after... As attitudes on the ground will not change with the stroke of a pen," rebel delegate Mabior Garang said late yesterday.