French President Emmanuel Macron Tuesday denounced "unacceptable blackmail" by Hamas after the Palestinian militant group threatened to execute some of the around 150 hostages it abducted in a weekend assault.

"The blackmail by Hamas after its terrorist acts is odious and unacceptable," Macron told reporters on a visit to Germany.

Less than three weeks ago, Israeli Prime Minister Benjamin Netanyahu sat beside President Joe Biden and marveled that a "historic peace between Israel and Saudi Arabia" seemed within reach — a diplomatic advance that he predicted could lead to lasting peace between the Israelis and Palestinians.

Biden was equally optimistic, telling Netanyahu during their meeting in New York, "If you and I — 10 years ago — were talking about normalization with Saudi Arabia, I think we'd look at each other like, 'Who's been drinking what?'"

A separatist group on Monday claimed a series of explosions in Corsica overnight, a new upsurge of violence after President Emmanuel Macron last month offered the French Mediterranean island a form of autonomy.

Around a dozen explosions were recorded across the island overnight on Sunday to Monday, mainly targeting second homes and building sites.

Former President Donald Trump and other GOP contenders tried to lay blame on the Biden administration after Hamas militants launched the deadliest attack on Israel in decades, citing a $6 billion transfer to Iran that administration officials insisted Saturday had yet to be spent.

Hamas' surprise early morning attack during a major Jewish holiday Saturday marks a new foreign policy front in a presidential election that has already been unusually dominated by foreign affairs. Russia's ongoing invasion of Ukraine has divided the Republican field, with some like Trump and Florida Gov. Ron DeSantis questioning the U.S.'s continued involvement, while others like former Vice President Mike Pence insist that supporting the Ukrainian military is vital to U.S. national security interests.

There will be only one winner in the war that has broken out between Israel and the Palestinian militant group Hamas. And it is neither Israel nor Hamas.

In an operation coined "the Al-Aqsa Storm," Hamas, whose formal name is the Islamic Resistance Movement, fired thousands of rockets into Israel on Oct. 7, 2023. Hamas and Palestinian Islamic Jihad fighters infiltrated Israel by land, sea and air. Hundreds of Israelis have been killed, more than 2,000 injured, and many taken hostage.

Iran on Monday rejected as unfounded allegations it had a role in the massive assault on Israel by the Palestinian Islamist group Hamas.

"The accusations linked to an Iranian role... are based on political reasons," foreign ministry spokesman Nasser Kanani told reporters, adding that Palestinians had "the necessary capacity and will to defend their nation and recover their rights" without any help from Tehran.

Supporters of Israel and backers of the Palestinian cause held competing rallies in several American cities Sunday over the conflict that has killed hundreds and wounded thousands in the Middle East.

In New York City, a skirmish broke out between opposing demonstrators near the United Nations compound after a large group of Palestinian supporters rallied in Times Square. Palestinian Americans protested outside the Israeli consulates in Atlanta and Chicago. Former House Speaker Nancy Pelosi led a Jewish community gathering to support Israel at a synagogue in San Francisco.

The U.N. Security Council has held an emergency meeting behind closed doors, with the United States demanding all 15 members strongly condemn "these heinous terrorist attacks committed by Hamas," but they took no immediate action.

U.S. deputy ambassador Robert Wood said afterward that "a good number of countries" did condemn the Hamas attack but not all council members. He told reporters they could probably figure out one of them.

The conflict between Israel and Hamas militants is making a global impact with Britain, Canada, France and Germany among nations stepping up security around potential Jewish targets as pro-Palestinian protests break out in the Middle East.

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The death toll from strong earthquakes that shook western Afghanistan has risen to over 2,000, a Taliban government spokesman said Sunday. It's one of the deadliest earthquakes to strike the country in two decades.

A powerful magnitude-6.3 earthquake followed by strong aftershocks killed dozens of people in western Afghanistan on Saturday, the country's national disaster authority said.