People living in the isolated north of Gaza have told the BBC that children are going without food for days, as aid convoys are increasingly denied permits to enter.

The BBC spoke to three people living in Gaza City and Beit Lahia, and viewed footage and interviews filmed by local journalists in Jabalia.

"We know there is a very serious risk of famine in Gaza if we don't provide very significant volumes of food assistance on a regular basis," said the WFP regional chief, Matt Hollingworth.

Duha al-Khalidi, a mother of four in Beit Lahia, told the BBC two weeks ago that she walked six miles (9.5km) to her sister's house in Gaza City, in a desperate search for food, after her children had not eaten for three days.

Video filmed in the Jabalia neighbourhood north of Gaza City shows residents sitting among the rubble of bombed out streets, digging down into the earth to tap large underground water pipes.

As Israel bombs Rafah, ahead of a widely expected ground offensive there, leaders on both sides are under pressure to end the suffering of people trapped in Gaza - their enemy's, and their own.

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