Palestinians gathered Tuesday on both sides of Gaza’s border with Egypt, hoping to get through the Rafah crossing after its reopening the previous day was marred by delays and uncertainty over who would be allowed to cross.

Medical evacuees from Gaza entered Egypt on Monday as the Rafah border crossing reopened.

But it still cannot be used to bring aid in, and though humanitarian support has increased via crossings from Israel, such assistance remains insufficient for the territory’s undernourished population...