Iran is holding a grand funeral service for those martyred in the 12-day aggression by Israel and the US against the Islamic Republic.

The funeral in capital Tehran for 60 nuclear scientists, military commanders and civilians martyred in Israeli strikes began at 8:00 am (0430 GMT) in Enqelab Square on Saturday, proceeding to Azadi Square, about 11 kilometers across the sprawling metropolis.

A huge crowd of mourners is participating in the procession, accompanying coffins with chants of "death to Israel" and "death to America".

Mohsen Mahmoudi, head of Tehran's Islamic Development Coordination Council, called it a "historic day for Islamic Iran and the revolution".

Among the martyrs is Mohammad Bagheri, a major general and the second-in-command of the armed forces after the Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei.

He will be buried alongside his wife and daughter, a journalist for a local media outlet, all martyred in an Israeli attack in Tehran.

Nuclear scientist Mohammad Mehdi Tehranchi, also martyred in the savage aggression, will be buried with his wife.

Chief commander of the Islamic Revolution Guards Corps (IRGC) Major General Hossein Salami, who was martyred on the first day of the unprovoked aggression, will also be laid to rest after Saturday's ceremony — which will also honor at least 30 other top commanders.

Of the 60 people who are to be laid to rest after the ceremony, four are children.

Iranian officials say more than 600 people, mostly civilians, were martyred in Israeli and US aggression against Iran.

The ceremony coincides with the second day of the Islamic month of Muharram, which commemorates the martyrdom of Imam Hussein, the third Shia Imam, and his 72 companions.

In 680 AD, Imam Hussein and his followers fought bravely for justice against the much larger army of the Umayyad caliph, Yazid I, in the Battle of Karbala, in southern Iraq.

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