A humanitarian pause in fighting between Israel and Hamas has been extended in Gaza Strip. It is bringing some relief to the enclave.

A UN agency estimates roughly 1.8 million people or 80 percent of the population have been displaced.

Trucks carrying aid have been coming in since the pause took effect on Friday. But aid workers on the ground say there is still not enough food, water or fuel to alleviate the crisis.

The United States says the first of three flights will be arriving with more aid on Tuesday.

The pause brokered by Qatar was extended by two days on Monday. Israel said it will extend the truce by one day, every time Hamas releases 10 more hostages.

Suzuki Hiroyuki, Project Associate Professor of University of Tokyo says Hamas may want to hold onto soldiers or adult men for future negotiations - and women and children hostages are easier to release.

He says, "It's possible that fighting could resume if Hamas delays the release of its hostages. If they keep freeing ten hostages a day, there will be almost no one left in about a week that they can let go easily."

International calls to further extend the truce are mounting, including an appeal from the UN Secretary General.

UN Secretary-General Antonio Guterres says, "Even with that additional amount of time, it will be impossible to satisfy all the dramatic needs of the population in Gaza."

US Secretary of State Antony Blinken is planning to visit the Middle East later this week. It will be his third visit to the region since the start of the conflict.

US President Joe Biden has expressed his hope for peace in the region. On his social media, he wrote ''A two-state solution is the only way to guarantee the long-term security of both the Israeli and Palestinian people."