American and Israeli negotiators were expected in Cairo over the weekend for a renewed push to reach a ceasefire-hostage deal in a conflict that has raged for nearly half a year, AFP reports.

Ahead of the talks, US President Joe Biden wrote to the leaders of Egypt and Qatar urging them to dial up pressure on Hamas to “agree to and abide by a deal,” a senior administration official told AFP on Friday night.

The United States, Qatar and Egypt have engaged for months in behind-the-scenes talks to broker a ceasefire and an exchange of hostages for Palestinian prisoners, but have made no headway since a week-long truce in November.

The White House confirmed that negotiations would occur this weekend in Cairo, but would not comment on US media reports that CIA Director Bill Burns would be attending, along with Israel spy chief David Barnea, Qatari Prime Minister Mohammed bin Abdulrahman Al-Thani and Egypt’s intelligence chief Abbas Kamel.

Israel and Hamas, which negotiate through intermediaries, have traded blame for the lack of progress.

“This basic fact remains true: There would be a ceasefire in Gaza today had Hamas simply agreed to release this vulnerable category of hostages — the sick, wounded, elderly, and young women,” the senior Biden administration official said.

Hamas officials and Qatari mediator Al-Thani have previously accused Israel of stymying the truce with objections over the return of displaced Gazan civilians and the ratio of prisoners to hostages.