Hopes dimmed on Tuesday in Morocco's search for survivors, four days after a powerful earthquake killed more than 2,900 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.

The Red Cross appealed for more than $100 million in aid to meet the "most pressing needs" in the north African country, including water, shelter, health and sanitation services.

Thousands of Israelis demonstrated Monday in Jerusalem to denounce the hard-right government's judicial overhaul ahead of a Supreme Court hearing on a key component of the reform package, AFP correspondents said.

"Democracy! Democracy!" chanted the protesters in front of the Supreme Court, waving Israeli flags.

Michael Telias, a 42-year-old professor, said: "We are here to try and stop this corrupted government's attempts to transform Israel, a liberal democracy, into a fascist regime."

President Joe Biden called Monday for Americans to unite despite bitter political differences as the United States marked the 22nd anniversary of Al-Qaeda's 9/11 attacks.

Bells were rung and the names of nearly 3,000 people were read out in somber ceremonies in New York, Washington and Pennsylvania where the hijacked planes struck.

"Let's honor September 11 by renewing our faith in one another," said Biden, speaking at a US military base in Anchorage, Alaska as he traveled back from a trip to India and Vietnam.

At least 150 people were killed when freak floods hit eastern Libya, officials said Monday, after storm Daniel swept the Mediterranean, lashing Turkey, Bulgaria and Greece.

Images filmed by residents of the Libyan disaster area showed massive mudslides, collapsed buildings and entire neighbourhoods submerged under muddy water.

Speaking on Libyan network Almasar, Oussama Hamad, prime minister of the east-based government, reported "more than 2,000 dead and thousands missing" in the city of Derna alone, but no medical sources or emergency services have confirmed such figures.

At least six people have been killed and dozens wounded in clashes in a Palestinian refugee camp in southern Lebanon, first responders said Monday as fighting raged for a fifth day.

Violence broke out late Thursday in the Ain al-Helweh camp on the outskirts of the coastal city of Sidon, just weeks after similar clashes pitted members of Palestinian president Mahmud Abbas's Fatah movement against Islamist militants.

Three decades after a historic handshake on the White House lawn that capped months of secret Israeli-Palestinian talks, disillusioned young Gazans face the consquences and failed promises of the once-celebrated Oslo Accords.

The agreements inked in the early 1990s were meant to lead to an independent Palestinian state, but years of stalled negotiations and bloody violence have left any peaceful resolution of the ongoing conflict a distant dream.

Yemen has one of the world's highest rates of contamination with landmines and other deadly explosives, the International Committee of the Red Cross has warned, nine years after the start of the brutal civil war.

The impoverished Arab nation, plunged into conflict when Iran-backed Huthi rebels seized the capital in September 2014, is among the three worst affected countries, the ICRC said.

Experts estimate that at least one million mines have been planted during Yemen's years of turmoil, causing a daily hazard along with unexploded shells and other military detritus.

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.

"We are happy to be here -- it's a good first step," said the official, who did not want to be named given the sensitivities of the visit, during the meeting.

"We thank UNESCO and the Saudi authorities."

India hailed its "strategic" partnership with oil-rich Saudi Arabia on Monday, days after unveiling a major trade and transport route linking Europe, the Middle East and India as part of a broad alliance.

"Together, we made the historic start to establish an economic corridor," Indian Prime Minister Narendra Modi told Saudi Arabia's de facto ruler Crown Prince Mohammed bin Salman in New Delhi.

Mohammed Sayed wipes sweat from his brow as he repairs another broken air conditioning unit at the height of the Saudi summer, his most stressful time of year.

The 28-year-old Sudanese national and his fellow technicians clock long hours as temperatures in the capital Riyadh clear 40 degrees Celsius (104 Fahrenheit) on a daily basis, highlighting the Gulf kingdom's dependence on machines the government is trying to make less environmentally taxing.