A health official in Gaza says experts are working to identify the bodies of 90 Palestinians handed over by Israel in exchange for dead hostages held by Hamas.
If they are unsuccessful, photos will be posted online so families can search for missing relatives, Dr Mohammed Zaqout, director general of hospitals for the Hamas-run health ministry, said.
It is not clear whether the bodies - stored at Nasser hospital in Khan Younis - belong to Palestinians who died in Gaza or in Israeli custody.
Footage filmed by a freelance journalist working for the BBC at Nasser's mortuary appeared to show the body of a blindfolded man. Another body seemed to have marks around the wrists and ankles.
The BBC has asked the Israeli military and justice ministry for comment. They have previously rejected accusations of widespread ill-treatment and torture of detainees.
Under last week's ceasefire agreement with Hamas, Israel has agreed to hand over the bodies of 15 Palestinians in return for every deceased Israeli hostage. So far, the Israeli military has said the remains of six Israeli hostages have been returned.
The body of another hostage - Nepalese - has also been returned from Gaza, along with the remains of another person who was not a hostage.
Israel has called on Hamas to 'make all necessary efforts' to recover the bodies of the remaining 21 deceased hostages as agreed.
Also outside Nasser hospital was Rasmieh Qdeih from Khuzaa, a town east of Khan Younis. She was searching for her son Fadi, 36, who has been missing since 7 October 2023.
At least 67,938 people have been killed by Israeli attacks in Gaza since then, according to the territory's health ministry, whose figures are seen by the UN as reliable.
Rasmieh said the wait to learn her son's fate was the most difficult she had ever experienced. 'If there's anything, I'll recognise him - my son's leg is amputated, and he has vitiligo... His hair is white. I'd know him,' she added.
