Hopes dimmed on Tuesday in Morocco's search for survivors, four days after a powerful earthquake killed more than 2,800 people, most of them in remote villages of the High Atlas Mountains.

Search-and-rescue teams from the kingdom and from abroad kept digging through the rubble of broken mud-brick homes, hoping for signs of life in a race against time following the 6.8-magnitude quake late Friday.

Thousands of Israeli academics and artists have urged U.S. President Joe Biden and United Nations Secretary-General António Guterres to shun Israeli Prime Minister Benjamin Netanyahu during his visit to the United States next week, underlining the divide between Israel's far-right government and segments of the country's population.

In an open letter published Wednesday, over 3,500 signers, including well-known Israeli writer David Grossman and painter Tamar Getter, called on Biden and Guterres not to meet with Netanyahu or invite him to speak at the U.N. General Assembly's yearly meeting of world leaders.

Israel's Supreme Court on Tuesday opened the first case to look at the legality of Prime Minister Benjamin Netanyahu's contentious judicial overhaul — deepening a showdown with the far-right government that has bitterly divided the nation and put the country on the brink of a constitutional crisis.

In a sign of the case's significance, all 15 of Israel's Supreme Court justices are hearing appeals to the law together for the first time in Israel's history. A regular panel is made up of three justices, though they sometimes sit on expanded panels. The proceedings were also being livestreamed.

At least 2,300 people were killed in Libya and thousands more were reported missing after catastrophic flash floods broke river dams and tore though an eastern coastal city, devastating entire neighborhoods.

As global concern spread, multiple nations offered to urgently send aid and rescue teams to help the war-scarred country that has been overwhelmed by what one U.N. official labelled "a calamity of epic proportions."

Scores of Israeli protesters on Monday flooded the streets outside the home of Israel's justice minister, the architect of the country's divisive judicial overhaul, a day before a pivotal hearing in which the Supreme Court will decide whether to accept the curbing of its powers.

Israeli police said they arrested six people in the central Israeli town of Modiin, home to Justice Minister Yair Levin, on charges of disrupting public order and blocking roads as they protested plans by Prime Minister Benjamin Netanyahu's far-right government to weaken the Supreme Court. The judicial plan has triggered one of the biggest domestic crises in Israeli history and exposed the country's bitter divides.

Moroccan soldiers and aid teams in trucks and helicopters battled Monday to reach remote mountain towns devastated by a monstrous earthquake that killed more than 2,400 people, with survivors desperate for help to find loved ones feared trapped under the rubble.

Moroccan officials have so far accepted government-offered aid from just four countries — Spain, Qatar, Britain and the United Arab Emirates — and some foreign aid teams said they were awaiting permission to deploy. Morocco's Interior Ministry says officials want to avoid a lack of coordination that "would be counterproductive."

The French government said on Monday it had pledged five million euros ($5.4 million) to aid organisations on site in Morocco after a devastating earthquake there.

The money will go to aid organisations already active in the disaster zone, Foreign Minister Catherine Colonna told the BFM broadcaster.

An Israeli delegation attended a UNESCO meeting in Riyadh on Monday, marking the country's first publicly announced visit to Saudi Arabia as speculation grows about a potential normalisation of ties.

The five-member delegation arrived on Sunday, an Israeli official told AFP, for the meeting to update UNESCO's world heritage list of cultural and historic sites.

The head of Israel's Mossad spy agency has said that Israel is prepared to strike "in the heart of Tehran" to track down the perpetrators of what he said were over two dozen Iranian attempts to hit Israeli and Jewish targets around the world.

Speaking at a security conference, David Barnea said that Israel and its allies had foiled 27 attacks over the past year in Europe, Africa, southeast Asia and South America.

People in Morocco slept in the streets of Marrakech for a third straight night as soldiers and international aid teams in trucks and helicopters began to fan into remote mountain towns hit hardest by a historic earthquake.

The disaster killed more than 2,100 people — a number that is expected to rise — and the United Nations estimated that 300,000 people were affected by Friday night's magnitude 6.8 quake.