Israel let tens of thousands of Palestinians go back to northern Gaza for the first time since the early weeks of the 15-month war with Hamas​, under terms of a fragile ceasefire​.

Tens of thousands of displaced Palestinians began returning home to northern Gaza on Monday, bracing for what awaits them in a region that has been reduced to rubble by months of brutal bombardment and fighting.

The head of the UN Relief and Works Agency for Palestine Refugees (UNRWA) said Tuesday that Israel's impending ban on the UN agency "will undermine" the ceasefire deal in the Gaza Strip.

A Palestinian man was killed and seven people were wounded by Israeli fire overnight, local health officials said Sunday, as crowds gathered in hopes of returning to the northern Gaza Strip under a fragile week-old ceasefire aimed at winding down the war.

A delegation from Palestinian group Hamas arrived in Cairo on Monday to discuss the implementation of ceasefire deal to end the war in Gaza, the group said in a statement. (Reporting by Ali Sawafta, Writing by Menna Alaa El-Din,

NBC News' Raf Sanchez reports on the fragile ceasefire deal between Israel and Hamas after a crisis over the weekend threatened to unravel the peace deal with a delay from Israel in allowing displaced Palestinians to return to their homes in the north of Gaza.

An agreement has been reached between Israel and Hamas that involves the release of additional hostages and the return of Palestinians to the northern part of the Gaza Strip.