Egyptian President Abdel Fattah el-Sisi has warned the forced displacement of Palestinians could be used by Israel to seize the little remaining Palestinian territory referred to as the Gaza Strip.
Israel ordered Palestinians in northern Gaza to move south to avoid being hit in a military attack.
But many Palestinians have stayed put, fearing their departure will be permanent.
Various United Nations members and Arab states have condemned Israel's actions as a violation of the Geneva Conventions that govern the impact of war on civilians.