Israeli air strikes on three houses in the southern Gaza city of Rafah killed 13 people and wounded many others, medics have said, Reuters reports.

Palestinian media outlets put the death toll at 15.

In Gaza City, in the north of the strip, Israeli planes struck two houses, killing and wounding several people, health officials said.

The strikes on Rafah, where over a million people are sheltering from months of Israeli bombardment, came hours before Egypt was expected to host leaders of Hamas to discuss prospects for a ceasefire agreement with Israel.

Two Hamas officials who spoke to Reuters did not disclose details of the latest proposals, but a source briefed on the talks told Reuters Hamas is expected to respond to Israels latest truce proposal delivered on Saturday.

The source said this included an agreement to accept the release of fewer than 40 hostages in exchange for releasing Palestinians held in Israeli jails and to a second phase of a truce that includes a “period of sustained calm” — Israel’s compromise response to a Hamas demand for a permanent ceasefire.

After the first phase, Israel would allow free movement between south and north Gaza and a partial withdrawal of Israeli troops from Gaza, the source said.

A senior Hamas official told Reuters the Monday talks in Cairo will take place between the Hamas delegation and the Qatari and the Egyptian mediators to discuss remarks the group has made over the Israeli response to its recent proposal.

“Hamas has some questions and inquires over the Israeli response to its proposal, which the movement received from mediators on Friday,” the official told Reuters. Those comments suggested Hamas may not hand an instant response to mediators over Israel’s latest proposal.