One source with knowledge of the talks, which slowed after the Israeli ground invasion, said a central point of discussion was a demand by the Israeli side for Hamas to provide a full list specifying the name and details of each person held in Gaza. The Israeli side was unwilling to cease bombardments without receiving this list.

Hamas responded that it was unable to provide the list without a pause in the fighting, as the estimated 240 hostages were held by a number of different groups in places across Gaza. That suggested even Hamas leaders do not know for sure how many people are held captive, their locations or the number who have survived the bombardments.

Another source said Hamas originally demanded prisoner exchanges, fuel and other supplies in return for the hostages, but these demands were dropped in favour of a halt to the airstrikes alone.

“Each time the Israeli counter-demand got harder,” the source said. Members of Hamas have previously said they took hostages in order to exchange them for the thousands of Palestinian prisoners held in Israeli jails.

…

Sources briefed on the talks told Reuters that the group discussed allowing small amounts of fuel into Gaza for humanitarian purposes, which Israel has so far refused, as well as the deal to free a small number of hostages in exchange for a ceasefire of one or two days. The outcome of the talks, however, remained unclear.

It sounds like these sources may be members of Hamas’ negotiating team, which I don’t exactly know that that’s a reliable source.