BBC News with Jerry Smit.

Tens of thousands of demonstrators in Hong Kong have continued their protest into a fourth night after paralyzing key parts of the city during the day. The crowds occupying central Hong Kong and other areas swelled after clashes on Sunday night with police who fired teargas to try to disperse them. Our China editor Carrie Gracie sent this report.

Throughout another hot day on the streets, Hong Kong's democracy protestors paralyzed traffic in the financial district. They kept busy handing out masks and goggles and filling plastic bottles with homemade remedies to counter teargas. As night fell, thousands upon thousands joined the demonstrators' ranks, many wearing the yellow ribbons that symbolize their points of democracy. The Chinese Government continued to impose strict censorship on mainland media coverage of the event here, determined to prevent the rest of its 1.3 billion citizens from witnessing these extraordinary scenes of political defiance.

The United States says it's closely watching the situation in Hong Kong and called on the authorities to show restraint. At a media briefing a White House spokesman Josh Earnest said that Washington supports the aspirations of the people of Hong Kong.

Around the world, and as it is so this is sure in Hong Kong and other places, the United States supports the internationally-recognized fundamental freedoms, such as the freedom of peaceful assembly and the freedom of expression. Uh, the United States urges the Hong Kong authority to exercise restraint and for protestors to express their views peacefully.

Earlier China said it will not tolerate any external support for what it called illegal movements.

The Israeli Prime Minister Benjamin Netanyahu has described Iran as a bigger threat to the world than Islamic State militants. Addressing the United Nations General Assembly, Mr. Netanyahu said that Iran's nuclear capabilities had to be fully dismantled. From New York, here's Nick Bryant.

Israeli Prime Minister claimed that a nuclear-armed Iran will pose the gravest threat to us all; and that Tehran was trying to bamboozle its way to an agreement that will cement its place as a threshold military nuclear power. This posed a greater threat, said Mr. Netanyahu, than the jihadists of Islamic State.

Make no mistake: ISIS must be defeated; but to defeat ISIS, and leave Iran as a threshold nuclear power, is to win the battle and lose the war.

There's been a dramatic opening day at the trial in Canada of a man accused of murdering and dismembering his lover and sending body parts through the post. Luka Magnotta pleaded not guilty to five charges relating to the death in 2012 of Jun Lin, a Chinese university student. But the trial judge told the court in Montreal that the accused had admitted carrying out the killing and jurors will now determine Mr. Magnotta's status of health.

World News from the BBC.

Forty-six Belgians had gone on trial charged with belonging to a jihadi organization alleged to have recruited fighters for Syria. Prosecutors at the trial in Antwerp said the organization had brainwashed young Muslims into going to fight in Syria where it said some had joined Islamic State. The group's alleged leader Fouad Belkacem was one of eight suspects to appear in court.

Turkish military police have used teargas and water canon to try and prevent hundreds of Turkish Kurds from crossing into Syria to join the battle against the Islamic State. The Turkish parliament is due to meet later this week to decide whether to authorize deployment of its military against the Islamic State. Our correspondent Mark Lowen on the Turkish-Syria border says Turkey has concerns about the Kurds as well as the Islamic State.

On the one hand it has the Islamic State continuing their shelling and moving up closer towards Komani; on the other hand it has increasing tensions with the Kurds. And what the Kurds are saying is that Turkey needs to realize that the real enemy here is the Islamic State and not the Kurds. Many of the Kurdish refugees believed that Turkey is blocking the West from arming the Kurdish militia in Syria for fear of reprisal attacks here in Turkey, but the Kurds are saying that only the Kurdish militia on the ground has the power, if they are properly armed, to repel Islamic State away from the borders of a rival NATO member.

Spain's Constitutional Court has suspended an independence referendum scheduled to take place in Catalonia in November. The regional leader of Catalonia Artur Mas had announced the date of the referendum on the weekend, following Scotland's vote on independence from Britain.

The southern Indian state of Tamil Nadu has sworn in a successor to Jayalalithaa, the colourful former Chief Minister who's been sent to jail for corruption. Her replacement O Panneerselvam wept during his inauguration, with colleagues saying they were in mourning.

BBC News.