CAIRO, Mar. 7 (Reuters) - Hamas on Thursday left Gaza ceasefire talks in Cairo where there was no sign of progress just days before the start of Ramadan, while the U.S. said the onus was on the Palestinian militant group to strike a deal on Israeli hostages.

Israel and Hamas blamed each other for the lack of agreement after four days of talks mediated by Qatar and Egypt about a 40-day ceasefire amid fears violence could escalate during the Muslim fasting month.

Egyptian security sources said talks, taking place without an Israeli delegation in Cairo, would resume on Sunday, the expected start of Ramadan.

Senior U.S. administration officials said the onus was on Hamas to complete a hostage deal and attributed the delay to what they described as Hamas so far not agreeing to release sick and elderly hostages.

A Hamas official told Reuters the United States was in partnership with Israel and that such comments were misleading. Hamas has insisted that a ceasefire deal include a process toward ending the war altogether.

Hamas said earlier in a statement the delegation left Cairo to speak to the movement's leaders, "with negotiations and efforts continuing to stop the aggression, return the displaced and bring in relief aid to our people."

Senior Hamas official Sami Abu Zuhri told Reuters Israel had been "thwarting" efforts to conclude a ceasefire deal.

Israeli Prime Minister Benjamin Netanyahu reiterated his intention on Thursday of pressing on with the military campaign in Gaza, launched after Hamas' Oct. 7 attack on southern Israel, in which Israel said 1,200 people were killed and 253 abducted.

Israel has previously said its aim is to destroy Hamas and that any ceasefire must be temporary. It has also pressed for a list of hostages still alive and held by Hamas in Gaza.

"Needless to say, Israel will do whatever it takes to release our hostages... unfortunately, it is Hamas who is the stumbling block right now by not telling us who is alive and who they have in their custody," Israeli government spokesman David Mencer said.

The deal presented to Hamas for a ceasefire in Gaza would require it to free some of the hostages it still holds. Palestinian prisoners held in Israel would also be released.

Photo from Reuters