Egypt closed the border yesterday morning and couldn't be able to allow a humanitarian aid to reach Gaza, a security source said.
The wounded Palestinians, too, could not cross over to Egypt for medical aid, though Egyptian ambulances were waiting for them at the border.
The source added that the Egyptian authorities preferred to close the Rafah border crossing until the situation reach stability in Gaza, especially Palestinian city of Rafah in order to protect workers and injured Palestinians who are willing to cross the border for help.
UN representative in Jerusalem, Robert Serry, received assurances yesterday that "all parties agreed" to a 72-hour truce in Gaza.
The internationally-brokered truce, which started this morning, ended two hours later when Israel's renewed firing on Gaza killed six people.
The Israeli military has, however, claimed that the truce ended after one of its soldiers was captured and two more were killed after the start of the ceasefire.