More than 1,500 trucks with humanitarian aid have entered the Gaza Strip in the first two days of the Israel-Hamas ceasefire, according to the United Nations Office for the Coordination of Humanitarian Affairs (OCHA).

The Israeli military says it “continues to attack” inside the Gaza Strip as a dispute with Hamas delayed the start of a planned ceasefire.

A source close to the ongoing Gaza ceasefire talks in Qatar told ABC News that Israel is waiting for Hamas to approve moving into a final "closing round of negotiations," adding there is a "real chance" for a "breakthrough" after a diplomatic blitz in Doha this weekend.

More than 630 humanitarian aid trucks entered the Gaza Strip on Sunday, United Nations Secretary-General Antonio Guterres told the Security Council, with at least 300 of those trucks going to the enclave's north,

Nearly 900 humanitarian aid trucks entered the Gaza Strip on Tuesday, the third day of a ceasefire between Israel and Palestinian militants Hamas, as a senior U.N. official said so far there had been no apparent law-and-order issues.

Desperately needed aid continued to pour into Gaza on Tuesday morning following Sunday's ceasefire between Israel and Hamas.

Aid trucks entered the Gaza Strip from Egypt at a cautious pace, as Egyptian officials tried to assess the pulse of a Gaza cease-fire agreement, amid hopes it would hold and be reinforced in the coming days,