Meetings between Hamas leaders and U.S. hostage negotiator Adam Boehler in recent days have focused on the release of an American-Israeli dual national being held by the militant group in Gaza, a senior Hamas official told Reuters on Sunday.

Israel carried out an air strike on militants in northern Gaza on Sunday, rattling an already fragile ceasefire as it prepared for fresh talks in Doha on the future of its truce with Hamas.

Israel estimates that 59 hostages are still held in Gaza with at least 22 of them alive. They are expected to be set free in a second phase of the Gaza ceasefire and prisoner exchange agreement, which would require Israel to fully withdraw its forces from Gaza and end the war permanently.

The announcement comes a week after Israel cut off all supplies of goods to the territory to over 2 million people.

“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 added to Hamas, after meeting with six former hostages released under the recently expired ceasefire deal pausing the war.

Retired Maj. Gen. Dana Pittard joins ‘Fox News Live’ to discuss President Donald Trump’s threats towards Hamas, calling on them to release all their hostages.

President Donald Trump this week once again threatened Hamas will have "hell to pay" if it doesn't release "all" of its remaining hostages -- including an American-Israeli -- now claiming this would be his "last warning" and that "it will be OVER" for Hamas if it does not comply.

Hamas reiterated on Sunday its insistence on moving directly into negotiating a second phase of the Gaza truce, as Israel announced it would dispatch a delegation to Doha for further

Panelists Eli Tsives and Aaron Cohen join ‘Fox News @ Night’ to discuss President Donald Trump’s comments on the Israel-Hamas war and recent arrests at anti-Israel college protests.