The United Nations estimates that about a quarter of the population are at risk of starvation, and the trickle of aid is barely scratching the surface of daily needs. Aid agencies are now focusing their efforts on delivering aid by sea and through airdrops.

A government source in Cyprus said a vessel carrying 221 U.S. tons (200 tonnes) of aid was scheduled to set sail on Monday, while the U.S. military said its vessel, the General Frank S. Besson, was also en route to provide humanitarian relief to Gaza by sea.

The conflict has displaced most of Gaza's 2.3 million people, with many cramped into makeshift tents with little in the way of food or basic medical supplies in the southern city of Rafah - which Israel says it plans to seize.