The testing second stage of Gaza's ceasefire was always in doubt; now it seems to be dead at the moment it was meant to start. Concern is mounting that war will return to this ravaged territory, deepening the profound suffering of Palestinians and threatening the lives of the remaining hostages held by Hamas.

Israel blocked aid trucks into Gaza as a cease-fire standoff has escalated, with Hamas calling on other mediators to intervene.

Israeli Prime Minister Benjamin Netanyahu's office on Sunday said the country had imposed a blockade on all humanitarian aid heading into the Gaza Strip.