Beirut: Millions of people in Iraninfo-icon and elsewhere marked the International Quds Dayinfo-icon to condemn a Middle Eastinfo-icon plan touted by USinfo-icon President Donald Trumpinfo-icon as the "deal of the century".

The biggest demonstrations were held in Iran, Lebanoninfo-icon and Gazainfo-icon where thousands took to the streets. Iran's Supreme Leader Ayatollah Seyyed Ali Khamenei had called this year's rallies more important than ever.

People in Tehraninfo-icon and other cities flocked to main streets to support Palestinians who are facing the dangerous prospect of a sellout of their rights through the US plan.

Demonstrators carried banners with slogans such as "Al-Quds is the eternal capital of Palestineinfo-icon" and "Death to Americainfo-icon" as well as "No to the deal of the century".

President Hassan Rouhani, who attended the rallies in Tehran, said the "deal of the century" would be the "bankruptcy of the century" for its sponsors and "definitely will not come to a fruition".

He said Quds Day is "the day the confrontation of all Muslims with the worldinfo-icon's aggressors and the event's message is that Palestine will be alive forever and al-Quds will remain for Muslims".

"We have no doubt that the ultimate victory will be for the righteous and Palestine and Palestine, and that the land of Palestine will be a safe place for Muslims, Christians and Jews," Rouhani added.

Similar rallies were held across the world, including in many Musliminfo-icon countries as well as in Europe and America, to show solidarity with the Palestinians and condemn Israeli atrocities and US policies. 

In Iraqinfo-icon, television networks broadcast live footage from tens of thousands of people who were rallying in several cities to condemn "the deal of the century" and support the Palestinian people.  

Alongside Tehran, Beirut and Damascus, "Quds Day" rallies are held in several European and American cities, among them London, Berlin and Toronto.

This year, however, the display of Hezbollahinfo-icon flags at the "Quds Day" march in London will likely result in arrests, following the British Parliament's vote in February to end the UKinfo-icon's controversial distinction between Hezbollah's "political" and "military" wings. 

The Islamic Human Rightsinfo-icon Commission (IHRC) which organizes the London march, conceded in its latest published advice to participants that carrying a Hezbollah flag would probably result in a police detention.

"Based on advice from the police and lawyers, please be aware that flying the Hezbollah flag could lead to you being arrested as it may be interpreted as support for a proscribed group, as Hezbollah is now a proscribed organization," the IHRC cautioned in a post on its website dated May 17.

Hamas leader Yahya Sinwar sent a grave warning to Israelinfo-icon ahead of Quds Day and used the opportunity to reject US President Donald Trump's plan and a summit in Bahraininfo-icon next month to promote it.

"Trump wants to sell al-Quds to the Zionists without paying a price," Sinwar said. "I call him from here and say that I and the Palestinian people will be demonstrating along the [Gaza] fence in light of Quds Day in numbers that have not been seen before."

Sinwar also warned to attack Tel Aviv and other cities with double the force if "the enemy dares to attack once again."

"We will not sell al-Quds ...We believe liberation of al-Quds will come soon," he added.

Trump's son-in-law Jared Kushner on Thursday met Israeli Prime Minister Benjamin Netanyahu in Jerusaleminfo-icon al-Quds to drum up support for the conference in Bahrain.

The Trump administration seeks to use the Bahrain meeting to bring Arab states traditionally opposed to the Israeli occupation of Palestinians lands into line.