United Nations chief Antonio Guterres on Friday said Israel has only authorized for Gaza what "amounts to a teaspoon of aid when a flood of assistance is required" and again signaled that the U.N. won't take part in a new U.

A limited amount of food was delivered to desperate Gazans for the first time since early March on Wednesday, but senior United Nations officials warned the supply was “nowhere near enough” to forestall the worsening humanitarian crisis.

Humanitarian organisations warn of acute levels of hunger among the 2.1 million population in Gaza after Israel eases its 11-week aid blockade.