Supporters shout slogans during a rally for Qasem Soleimani in southern suburbs of Beirut, Lebanon on Monday. Photo: Xinhua/ Bilal Jawich

Mourners packed the streets of Tehran on Monday for ceremonies to pay homage to top Iranian military commander Qasem Soleimani, after he was killed in a US strike in Baghdad.

Clutching portraits of their hero, the crowd gathered at Tehran University before Supreme Leader Ayatollah Ali Khamenei presided over prayers for the slain general, AFP correspondents reported.

Soleimani, who spearheaded Iran's Middle East operations as commander of the Revolutionary Guards' Quds Force, was killed in a US drone strike Friday near Baghdad airport.

His assassination ratcheted up tensions between archenemies Tehran and Washington. Iran said late Sunday it was further rolling back its commitments to a nuclear deal already in tatters since US President Donald Trump unilaterally withdrew from it in May 2018.

In freezing early morning temperatures, women in black walked alongside men holding up flags bearing the names of Shiite imams as they walked down Tehran's Enghelab (Revolution) Street toward the university.

"Down with USA," said a placard held up by a young woman wearing a black chador.

The procession was broadcast live on state television, with screens bearing a black ribbon across the top left hand ­corner in a rare tribute.

Khamenei appeared to cry as he prayed over the flag-draped coffins containing the remains of Soleimani and five other "martyrs" killed in the strike.

The supreme leader was flanked by Soleimani's son, the slain general's replacement as Quds commander Esmail Qaani, President Hassan Rouhani, parliament speaker Ali Larijani and the Guards' top commander Major General Hossein Salami.

People prayed together with Khamenei whose voice cracked as he spoke.

"We must give a crushing response," one of the mourners told AFP.

"We must target whatever military base they have in the region. We must attack all that are in the range of our missiles," said the 61-year-old businessman who gave his name as Afkhami.

The US drone attack that killed Soleimani was ordered by Trump, who said the Quds commander had been planning an "imminent" attack on US diplomats and forces in Iraq.

Mourners in Tehran formed a sea of black along Enghelab Street dotted with red Shiite flags and white signs.

One of the placards held aloft by a man read "#hard_revenge."

As they marched toward the university, a main artery of the Iranian capital, the mourners chanted "Death to America" and "Death to Israel" and waved flags of Iraq and Lebanon among others.

The procession came after Soleimani's remains were returned to Iran on Sunday.