A U.S. official with knowledge of the negotiations said Hamas made a last-minute revision that relates to the distance Israeli forces would withdraw from at least one largely populated area in Gaza that the official would not identify. The issue is expected to be resolved quickly and enable the ceasefire to begin as planned this weekend, according to the official, who was not authorized to discuss the matter publicly and spoke on condition of anonymity.

In a briefing Thursday, David Mencer, an Israeli government spokesman, said the Israeli delegation of negotiators remained in Qatar, “continuing its efforts to reach a solution.”

Izzat al-Rishq, a senior Hamas official, said the militant group “is committed to the ceasefire agreement, which was announced by the mediators.”