Aid agencies said they have resumed relief operations in Gaza, but fighting still prevents them from evacuating the sickest people and reaching all those who need help.

The international Red Cross said it brought in seven truckloads of medical supplies and would distribute them to hospitals overwhelmed by the influx of patients.

International aid groups, however, say Israel is not doing enough to protect Palestinian civilians as well as aid workers. Tens of thousands of people have been displaced and many basic food items are no longer available, the office of the U.N. Humanitarian Coordinator said.

As many 88 percent of Gaza's residents now require food aid, up from 80 percent before the war, said Helene Gayle, president of the international aid agency CARE.

The three-hour lull in fighting that Israel allows for humanitarian aid to move around Gaza is not sufficient, she said.