US President Donald Trump on Wednesday issued what he called a “last warning” to Hamas to release all remaining hostages held in Gaza, directing a sharply-worded message after the White House confirmed he had recently dispatched an envoy for unprecedented direct talks with the militant group.

Trump, in a statement on his Truth Social platform soon after meeting at the White House with eight former hostages, added that he was “sending Israel everything it needs to finish the job.”

“Release all of the Hostages now, not later, and immediately return all of the dead bodies of the people you murdered, or it is OVER for you,” Trump said. “Only sick and twisted people keep bodies, and you are sick and twisted!”

Trump's hawkish language came after the United States confirmed the unprecedented direct talks with Hamas, with the US envoy on hostage affairs, Adam Boehler.

Boehler, founder and CEO of Rubicon Founders, a healthcare investment firm, was a lead negotiator on the Abraham Accords team during Trump’s first term that strove to win broader recognition of Israel in the Arab world.

The talks, which took place last month, focused mainly on the release of American hostages, and a potential end of the war without Hamas in power in Gaza, according to a Hamas official who spoke on condition of anonymity.

Israeli officials say about 24 living hostages - including Edan Alexander, an American citizen - as well as the bodies of at least 35 others are believed to still be held in Gaza.

Confirmation of the talks in the Qatari capital of Doha come as the Israel-Hamas ceasefire remains in the balance.

The first phase of a ceasefire ended over the weekend after six weeks of relative calm that included exchanges of Israeli hostages for Palestinian prisoners held in Israeli jails.

While Israel has said it wants to extend the first phase until mid-April, Hamas has insisted on a transition to the second phase, which should lead to a permanent end to the war.

But Israel has ramped up pressure, not just with threats, by halting all entry of goods and supplies into Gaza.

France, Britain and Germany jointly on Wednesday called the humanitarian situation in Gaza "catastrophic," and urged Israel to ensure the "unhindered" delivery of aid. (Agencies)