By Alexander Cornwell, Nidal al-Mughrabi and Michelle Nichols

JERUSALEM/CAIRO/NEW YORK (Reuters) - There is a "narrow window" to prevent famine from spreading further in Gaza, a top U.N. official said on Sunday, calling on Israel to allow unimpeded aid delivery in the territory, where it is fighting Palestinian militant group Hamas.

LONDON (Reuters) -British police said on Sunday they had arrested almost 900 people at a demonstration the previous day in support of Palestine Action, and the government appealed for people to stop demonstrating in support of the banned campaign group.

Britain proscribed Palestine Action under anti-terrorism legislation in July after some of its members broke into a Royal Air Force base and damaged military planes.

A total of 890 people were arrested in London during a protest this weekend in support of the banned group Palestine Action, the capital's Metropolitan Police said Sunday.

The force said 857 people had been arrested under anti-terror laws for supporting a proscribed group during Saturday's demonstration, with an additional 33 arrested for other offences including assaults on police officers.

By Luke Tyson, Hadeel Al Sayegh and Iain Withers

DUBAI/LONDON (Reuters) - Emirati real-estate developers are looking to lure British investors to the United Arab Emirates where a weaker dirham, pegged to the U.S. dollar and battered by Donald Trump's tariffs, has made property significantly cheaper for buyers with pounds.

Their push to target British investors locally with new London offices comes as UAE developers contend with a domestic market that has been one of the best-performing globally but is now prompting concern about oversupply and too few buyers.

Eight key members of the OPEC+ alliance said Sunday they have agreed to again boost oil production, in a strategy analysts saw as a bid to gain a bigger market share of crude sales.

Oil ministers in the V8 grouping -- comprising Saudi Arabia, Russia, Iraq, the United Arab Emirates, Kuwait, Kazakhstan, Algeria and Oman -- decided to increase production by 137,000 barrels a day (bpd) from next month, they said in a statement.

Those countries had already increased production by 2.2 million bpd in recent months.

In "Palestine 36," director Annemarie Jacir recounts a year of Arab revolt against British colonial rule that she says is crucial to understanding current events in the Middle East.

"You can't understand where we are today without understanding 1936," Jacir told AFP a day after the film's world premiere at the Toronto International Film Festival.

By Alexander Cornwell

TEL AVIV (Reuters) -Thousands of Israelis rallied in Tel Aviv on Saturday night, issuing direct appeals to U.S. President Donald Trump to force an end to the Gaza war and secure the release of the hostages.

Protesters packed a public square outside the military headquarters, waving Israeli flags and holding placards with images of the hostages. Some carried signs, including one that read: 'Trump’s legacy crumbles as the Gaza war persists'.

Another said: "PRESIDENT TRUMP, SAVE THE HOSTAGES NOW!"

A gentle study of dysfunctional families by veteran American director Jim Jarmusch clinched the top prize at the Venice Film Festival Saturday, while a harrowing docudrama about the Gaza war took second.

Jarmusch's "Father Mother Sister Brother" starring Cate Blanchett, Adam Driver and Tom Waits, drew mostly positive reviews for its humorous portrayal of awkwardness and guilt.

The "Broken Flowers" director, who wrote the script for three family get-togethers in upstate New York, Dublin and Paris, had called it "a kind of anti-action film".

More than 400 people were arrested in London on Saturday during a tense protest in support of the Palestine Action group, which has been banned under terror laws, police said.

Several hundred people demonstrated in front of the UK parliament, with some holding placards that read: "I oppose genocide. I support Palestine Action."

The capital's Metropolitan Police force (Met) had warned people that it would not hesitate to arrest anyone who explicitly expressed support for the prohibited group.

By Vitalii Yalahuzian and Yann Tessier

LONDON (Reuters) -British police arrested dozens more people on Saturday under anti-terrorism laws for demonstrating in support of Palestine Action, a pro-Palestinian group banned by the government as a terrorist organisation.

Britain banned Palestine Action under anti-terrorism legislation in July after some of its members broke into a Royal Air Force base and damaged military planes. The group accuses Britain's government of complicity in what it says are Israeli war crimes in Gaza.