Head of refugee agency says wheat, flour and hygiene supplies taken as Israel continues its bombardment

• Israel-Hamas war: live updates

Order is beginning to collapse in the besieged Gaza Strip after thousands of desperate people raided UN warehouses in search of food, as the international criminal court’s top prosecutor said impeding relief supplies to the population may constitute a crime under the court’s jurisdiction.

Wheat, flour and hygiene supplies were taken from on Saturday from four UN-run centres across the blockaded 25- by 7-mile strip, home to more than 2 million trapped people, Thomas White, Gaza director for the UN’s agency for Palestinian refugees (UNRWA), said on Sunday.

A UN peacekeeper on the Blue Line between Israel and Lebanon was injured in cross-border fire, the world body said.

Rishi Sunak and Emmanuel Macron “stressed the importance of getting urgent humanitarian support” into Gaza.

Jack Sullivan, Joe Biden’s national security adviser, said the US believed “there should be humanitarian pauses to get hostages out, potentially to get aid in”.

A delegation of families of Israeli hostages being held by Hamas urged President Isaac Herzog to keep their plight at the top of the political agenda.

Mahmoud Abu Amir is among thousands of Palestinians frantically trying to locate their loved ones from afar

• Israel-Hamas war: live updates

For Mahmoud Abu Amir, the war in his native Gaza began on Monday 9 October. An Israeli airstrike flattened a large area in the Jabalia refugee camp where he spent most of his life, demolishing the apartment block that was sheltering most of his family including his wife, Mayar, and their two young children.

Two days earlier, Hamas militants had stormed towns and kibbutzim near the Gaza Strip, killing 1,400 Israelis and taking at least 200 more hostage. When Abu Amir called his family that day to check on them, “it was a shock”, he said. “No one expected this to happen. But my wife, and my entire family were dead scared. They knew something would happen to them. They live near the border and they knew they would pay the price.”