A health official in Gaza says experts are working to identify the bodies of the 90 Palestinians handed over by Israel in exchange for dead hostages held by Hamas.
If they were unsuccessful, photos would be posted online so families could 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 a 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.
