Qatari, U.S. and Egyptian negotiators are operating a communications center in Cairo to secure a ceasefire in Gaza, with Donald Trump saying he is not confident the break in fighting will last.

Violations have been reported. Gaza medics said on Monday that eight people had been hit by Israeli fire. The start of the ceasefire was also delayed as Hamas did not provide the names of the hostages to be released.

Trump claimed his envoy helped break months of deadlock to secure the deal before he took office. But he appeared to distance himself from the conflict when asked after Monday's event if he thought the situation would continue. "That's not our war. It's their war," he told reporters.

A senior Qatari diplomat said on Tuesday that negotiators were confident the U.S. president would support the deal because his team played a key role in securing it.

"Without (Trump) this deal would not be in place now. So we count on the support of this government," said Majed al-Ansari, adviser to the Qatari prime minister and spokesman for the foreign ministry. Trump's special envoy Steve Witkoff is in contact every day, he said.

The first phase of the ceasefire is scheduled to last six weeks, with more challenging second phase negotiations expected to begin in early February.

Trust between the two sides is negligible, so the purpose of the communications center is to prevent the ceasefire from breaking down over accusations of violations.

The release of hostages and prisoners was also scheduled separately to allow time for coordination. Ansari said the previous ceasefire agreement in November 2023 was "always fragile," in part because of the tight timeline for releases by both sides.

"The lists were delayed, they were submitted after the proposed deadline... There are a lot of discrepancies between what was agreed and the list we have," he said.

The current agreement "gives us sufficient time to exchange lists, agree on lists, deal with any issues with lists that may arrive and deal with any irregularities".

When violations are reported to the Cairo center, which operates around the clock, mediators speak to both parties and aim to prevent the situation from escalating.

"This is what happened in the last 48 hours. We received calls about possible violations and we dealt with them immediately and maintained the ceasefire," Ansari said.

He declined to comment on specific reported violations, citing the sensitivity of the ceasefire arrangements.

As part of the deal, work has begun to increase the delivery of aid to Gaza. More than 900 aid trucks and 12,500 liters of fuel from Qatar have crossed the border since Sunday, and Ansari said he hoped that number would increase.

The supplies will mainly be used to meet basic needs in a region ravaged by 15 months of war, where most people are hungry and health systems have been devastated. If a future stage is reached, reconstruction work is not expected to begin.

A Trump transition official told U.S. reporters that the administration is discussing resettling 2 million Palestinians during reconstruction, with Indonesia as a possible destination.

Ansari said this was a red line for Qatar, which could not support "any plan that ends with relocation or reoccupation," but that the current focus was on keeping negotiations on track. "What we are concerned about now is the implementation of the agreement, moving it through its second phase and achieving sustainable peace in Gaza."