Police in Iran said on Saturday they have implemented a plan to deal with women who violate the country's strict Islamic dress code.

The number of women defying the dress code that headscarves must be worn in public has increased since a protest movement triggered by the death in custody last year of Kurdish-Iranian Mahsa Amini, 22, for allegedly flouting it.

A statement on the police website on Saturday said action would be taken "from today" over violations in public places, in cars and other "sites where hijab is sometimes removed".

Sultan Al Jaber, president of the COP28 climate talks, called on Saturday for "available, accessible and affordable" finance for the developing economies most vulnerable to the destructive impacts of a warming planet.

Al Jaber, who is also head of the United Arab Emirates' national oil company, said he had urged G7 climate and environment ministers meeting in Japan this weekend to prioritise support for poorer countries.

Fierce fighting raged in Sudan's capital despite a pause Sunday to help those caught up in the violence, on the second day of battles that left three UN staff among more than 50 civilians killed nationwide.

Doctors say hundreds are injured, while the World Health Organization warned "several of the nine hospitals in Khartoum receiving injured civilians have run out of blood, transfusion equipment, intravenous fluids and other vital supplies".

The World Food Programme said it was suspending operations in the impoverished country after the killing of its three workers.

Hundreds of prisoners of war, including Saudis, were freed Saturday as part of a cross-border exchange between a Saudi-led military coalition and Yemen's Iran-backed Huthi rebels, the International Committee of the Red Cross said.

The flights connecting Saudi Arabia and Huthi-held territory in Yemen were part of a multi-day transfer involving nearly 900 detainees, and came amid peace talks which have raised hopes for an end to Yemen's eight-year-old war.

Thousands of people demonstrated Friday across Iran and several Arab countries to mark Jerusalem Day in support of the Palestinian cause, amid a surge in violence in the Israeli-Palestinian conflict.

Recent weeks have seen deadly attacks and clashes in Israel, annexed east Jerusalem and the occupied West Bank, as well as cross-border fire between Israeli forces and militants in the Gaza Strip, Lebanon and Syria.

The rallies in Iran, an annual fixture since the 1979 Islamic revolution, are held on the last Friday of the Muslim holy fasting month of Ramadan.

Some prayed on the tarmac and others raised fists of defiance as prisoners from Yemen's grinding war were released on either side of the country's divide on Friday.

Families in the capital Sanaa, held by the Huthi rebels, and government-controlled Aden were able to celebrate the end of their long wait as a major prisoner exchange got under way.

After years in captivity, more than 300 rebel and pro-government fighters were flown between the two cities -- Sanaa in the north, and Aden on the south coast.

Thousands of Iranians took to the streets Friday across the country to mark Jerusalem Day in solidarity with Palestinians, state media reported.

The rallies, an annual fixture since Iran's 1979 Islamic revolution, are held on the last Friday of the Muslim holy month of Ramadan.

"The Palestinians are actively confronting Israeli aggression from Gaza to the heart of Tel Aviv," said parliament speaker Mohammad Bagher Ghalibaf amid a surge in violence in the Israeli-Palestinian conflict since the start of the year.

Iraqi cleric Moqtada Sadr, who wields great influence over national politics, said Friday he was "freezing" for a year his powerful movement over "sinful" practices among supporters.

Sadr, a Muslim Shiite leader, has the ability to mobilise tens of thousands of his supporters with a single message and presents himself as an anti-corruption champion, often clashing with Iraq's political leadership.

Hundreds of captives from Yemen's brutal civil war were reunited with friends and family as a major prisoner swap started on Friday, hours after truce talks broke up with an agreement to meet again.

As hopes rise of an end to Yemen's devastating eight-year war, which pits Iran-backed rebels against a Saudi-led coalition, 318 prisoners flew on four flights between government-controlled Aden and the Huthi-held capital, Sanaa.

A major exchange of prisoners from Yemen's brutal civil war got underway on Friday with the first plane departing rebel-held Sanaa for government-controlled Aden, the International Committee of the Red Cross said.

"The first flight from Sanaa has left," ICRC media adviser Jessica Moussan told AFP, signalling the start of a three-day operation that will see nearly 900 prisoners released.

More than 300 prisoners will fly between the two cities on Friday. Later, detainees will also be released in Marib and Mokha, and in Riyadh and Abha in neighbouring Saudi Arabia.