Palestinians trying to return to northern Gaza were stranded on two highways in a standoff that threatened to undo the shaky peace between Israel and Hamas.

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.

Prime Minister Sir Keir Starmer has paid tribute to US President Donald Trump for his "role in securing the landmark ceasefire and hostages deal in Gaza" during a call between the two leaders.

The first week of the latest ceasefire between Israel and the Hamas militant group is complete. Hamas has begun to release hostages and Israel has freed nearly 300 Palestinian prisoners. But the deal has hit its first major complication.

Both the Trump and Biden administrations have publicly claimed credit for pushing the agreement over the line.

The deal hit its first major complication when Israel said a female civilian hostage named Arbel Yahoud was supposed to be released but wasn't.

The chairman of a coalition, which successfully lobbied Arab-Americans to vote for Donald Trump, has slammed the new president for his weekend comments on Gaza.

Palestinians are returning to areas ruined by 15 months of war after Israel and Hamas resolved a dispute over hostages that threatened to derail the ceasefire.

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.