Hamas fighters holed up in the Israeli-held Rafah area of Gaza will not surrender to Israel, the group’s armed wing said on Sunday, urging mediators to find a solution to a crisis that threatens the month-old ceasefire.

Sources close to mediation efforts told Reuters on Thursday that fighters could surrender their arms in exchange for passage to other areas of the enclave under a proposal aimed at resolving the stalemate.

Egyptian mediators have proposed that, in exchange for safe passage, fighters still in Rafah surrender their arms to Egypt and give details of tunnels there so they can be destroyed, said one of the sources, an Egyptian security official.

Hamas armed wing said it will hand over a body of deceased Israeli soldier Hadar Goldin in Gaza on Sunday at 2 p.m. (1200 GMT).

It said Goldin’s body was located in a tunnel in Rafah in the southern Gaza Strip on Saturday.