Israel and Hamas are not close to a deal on a cessation of hostilities in Gaza and releasing hostages, mediator Qatar said on Tuesday, warning the situation remained "very complicated".

Despite weeks of talks involving US, Qatari and Egyptian mediators, the Muslim holy month of Ramadan began on Monday without the start of a widely expected truce and hostage exchange.

"We are not near a deal, meaning that we are not seeing both sides converging on language that can resolve the current disagreement over the implementation of a deal," foreign ministry spokesman Majed al-Ansari told a news conference.

All parties were "continuing to work in the negotiations to reach a deal hopefully within the confines of Ramadan", Ansari said.

But he added that he could not "offer any timeline" on a deal and explained the conflict remained "very complicated on the ground".

The war started with the October 7 Hamas attack that resulted in about 1,160 deaths in Israel, mostly civilians, according to an AFP count based on Israeli official figures.

The militants also took around 250 hostages, dozens of whom were released during a week-long truce in November. Israel believes 99 hostages remain alive in Gaza, along with the bodies of 31.

Israel's retaliatory bombardment and ground offensive have killed 31,112 Palestinians, mostly women and children, according to Gaza's health ministry.

Previously, Qatar mediated a one-week break in fighting in late November that led to the release of scores of Israeli and foreign hostages, as well as aid entering the besieged Palestinian territory.