Mourners in black began gathering Tuesday for days of funerals and processions for Iran's late president, foreign minister and others killed in a helicopter crash, a government-led series of ceremonies aimed at both honoring the dead and projecting strength in an unsettled Middle East.

For Iran's Shiite theocracy, mass demonstrations have been crucial since millions thronged the streets of Tehran to welcome Grand Ayatollah Ruhollah Khomeini in 1979 during the Islamic Revolution, and also attended his funeral 10 years later. An estimated 1 million turned out in 2020 for processions for the late Revolutionary Guard Gen. Qassem Soleimani, who was slain in a U.S. drone strike in Baghdad.

Iran's first Vice President Mohammad Mokhber was appointed as acting president of the Islamic Republic on Monday after the death of President Ebrahim Raisi in a helicopter crash in the country's northwest.

Mokhber, 68, largely has been in the shadows compared to other politicians in Iran's Shiite theocracy. Raisi's death under the constitution thrust Mokhber into public view. He is expected to serve as caretaker president for some 50 days before mandatory presidential elections in Iran.

Iran's powerful allies on Monday mourned the death of its President Ebrahim Raisi in a helicopter crash, while regional militants hailed him as a supporter of the Palestinian cause.

Russia and China called the ultraconservative leader a "friend", while Iran's arch-foes the United States and Israel had yet to react publicly.

Separatists in riot-hit New Caledonia refused Monday to abandon road blocks that have paralysed the Pacific archipelago for a week in defiance of a major security operation by French forces.

France has sent 1,000 security forces to its overseas territory that has been rocked by seven nights of violence that have left six dead, including two gendarmes, and hundreds injured.

The helicopter crash that killed Iran's president and foreign minister has sent shock waves around the region.

Iranian state media said on Monday that President Ebrahim Raisi, the country's foreign minister, Hossein Amirabdollahian, and others have been found dead at the site after an hourslong search through a foggy, mountainous region of the country's northwest.

The helicopter crash in which Iranian President Ebrahim Raisi, the country's foreign minister and other officials were killed is likely to reverberate across the Middle East, where Iran's influence runs wide and deep.

That's because Iran has spent decades supporting armed groups and militants in Lebanon, Syria, Iraq, Yemen and the Palestinian territories, allowing it to project power and potentially deter attacks from the United States or Israel, the sworn enemies of its 1979 Islamic Revolution.

Iranian President Ebrahim Raisi, the country's foreign minister and others were found dead Monday hours after their helicopter crashed in a foggy, mountainous region of the country's northwest, state media reported. Raisi was 63.

Ukrainian President Volodymyr Zelensky said in an exclusive interview with AFP that he expects Russia to step up its offensive in the northeast and warned Kyiv only has a quarter of the air defences it needs to hold the front line.

The number of violent incidents reported in the French Pacific territory of New Caledonia fell slightly on Friday, a day after France imposed a state of emergency as 1,000 promised reinforcements for security services were deployed with increased powers to quell unrest in the archipelago that has long sought independence.

The top French official in the territory, High Commissioner Louis Le Franc, announced stringent measures Friday under the state of emergency declared by President Emmanuel Macron. In light of severe public order disturbances, a curfew from 6 p.m. to 6 a.m. is now in effect.

Slovakia's Prime Minister Robert Fico was seriously wounded in an apparent assassination attempt just weeks before a Europe-wide election that has been deeply divisive. He was shot multiple times in an attack in the town of Handlova that authorities described as politically motivated, although they said the suspect did not belong to any political groups.

Here's a global look at other notable assassinations and assassination attempts during the 21st century: