The first phase of Israel's offer would last for six weeks and would include a "full and complete" ceasefire, the withdrawal of Israeli forces from "all populated areas" of Gaza and the "release of a number of hostages including women, the elderly, the wounded in exchange for the release of hundreds of Palestinian prisoners."
From May 7 to May 20, not a single WFP truck crossed from the southern corridors from Egypt into Rafah.
Advocates of the two-state solution have envisaged a Palestine in the Gaza Strip and West Bank linked by a corridor through Israel.
Survivors said families were preparing to sleep when the strike hit the Tel Al-Sultan neighbourhood where thousands were sheltering after Israeli forces began a ground offensive in the east of Rafah over two weeks ago.
Saudi Arabia on Monday also condemned Israel's latest attack on Rafah.
Tensions have been growing between Egypt and Israel over the Israeli military operation in Rafah at the southern end of the Gaza Strip, just across the border from Egypt.
The closure of the Rafah crossing has left thousands of sick and injured Palestinians trapped in Gaza, unable to seek treatment abroad.
Israel has shut down both the Rafah and Kerem Shalom crossings for aid and people as part of its military operation in Rafah.