A United Nations aid agency says it will have to halt food distribution to 750,000 needy Gazans by Friday if Israel keeps the territory sealed. Agency spokesman Chris Gunness says food stockpiles are running low. Israel sealed Gaza's crossings last week after Gaza terrorists fired rockets at Israeli border towns for several days. Hamas says the rocket fire came in response to an Israeli incursion into Gaza. Both sides say they're ready to return to a cease-fire that took effect in June. Israel has not said when it will re-open the crossings. On Tuesday, Israel allowed fuel to enter Gaza for the territory's power plant.