The ceasefire agreement between Israel, Hamas and Hezbollah is in new jeopardy Sunday as various groups slow walk responsibilities under the deal.

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.

Hamas released four Israeli hostages in Gaza early Saturday in exchange for 200 Palestinian prisoners to be released later in the day. It was the second release to occur as part of the ceasefire agreement that began last weekend. Israel followed with the release of 200 Palestinian prisoners.

U.S. ships are returning to the Red Sea following promises from Yemen’s Houthi rebels to abstain from attacks on American and British vessels. The pledge, which comes after more than a year of

Michael Levy, brother of hostage Or Levy, joins Andrea Mitchell to discuss the ceasefire agreement and the critical need for sustained international support. Levy expressed cautious optimism about the agreement,

Thirteen-year-old Zakariya Barbakh had spent most of his life shuffling between hospitals across Gaza, the occupied West Bank and Israel.

The fragility of the truce between Israel and Hamas was laid bare on Saturday, after Israel accused Hamas of withholding a hostage, prompting a halt in the movement of Gazan civilians back to their homes in the north.

More than 375,000 Palestinians have made their way back to homes in northern Gaza after 15 months on the run because of war.

Long lines of Palestinians -- some kneeling to kiss the soil as they stepped into the northern part of the strip -- were making their way home on Monday.

Palestinians are streaming into northern Gaza and returning to what's left of their homes as the ceasefire holds. UNICEF spokesman Jonathan Crickx joins Chris Jansing from Rafah to describe the scope of the humanitarian effort and the challenges they are facing.