Police used tear gas in Tehran after a crowd of angry protesters broke into the Saudi embassy, ravaging its offices and throwing Molotov cocktails at the building. The mayhem broke out at a rally set off by Riyadh’s execution of a prominent Shiite cleric.

VIDEO: 12:08 AM, seems molotov cocktail thrown at Saudi embassy building in Tehran, protest over al-Nimr execution pic.twitter.com/d6vFKPcD6R — Sobhan Hassanvand (@Hassanvand) January 2, 2016

Footage uploaded on Twitter by Iranian journalist Sobhan Hassanvand showed angry protesters pillaging the ground floor of the Saudi embassy, tearing apart furniture, flags, and documents. It was then engulfed in one big blaze, seemingly after the angry mob, outraged over the Saudi execution of prominent Shiite cleric Sheikh al-Nimr, threw Molotov cocktails at the building.

Video shows protesters inside Saudi embassy in Tehran pic.twitter.com/DEmsNLI6ZG — Sobhan Hassanvand (@Hassanvand) January 2, 2016

Protesters break into Saudi embassy building in Tehran pic.twitter.com/7wtBGpZuco — Sobhan Hassanvand (@Hassanvand) January 2, 2016

One of the protesters was also pictured holding a torn Saudi flag, which was reportedly brought down at the compound, outside the embassy.

معترضان در سفارت عربستان در تهران را شکستند و وارد سفارت خانه شدند pic.twitter.com/WlaZXXtne8 — Behnam2k (@behnam2k) January 2, 2016

گویا عده ای از تجمع کنندگان پرچم سفارت عربستان در تهران را کنده و پایین آورده اند pic.twitter.com/5MOZTlQN1b — Behnam2k (@behnam2k) January 2, 2016

Police eventually resorted to tear gas to scatter the protesters and managed to force the crowd out of the building and cordon it off again.

Police disperse protesters at Saudi embassy in Tehran Firefighters are trying to put off fire at embassy pic.twitter.com/WWb1QCURQG — Sobhan Hassanvand (@Hassanvand) January 2, 2016

There were no immediate reports of casualties or injuries due to the violence. Photos from inside the ravaged ground floor appear to show it is now empty.

Thick dark smoke coming out of windows of Saudi embassy building in Tehran pic.twitter.com/pAyfMkEexJ — Sobhan Hassanvand (@Hassanvand) January 2, 2016

Iran’s Foreign Ministry issued a statement early on Sunday calling for calm and asking protesters to respect the property of diplomatic premises, the Entekhab news website reported.

A ministry’s spokesman, Hossein Jaber Ansari, then said there should be no further demonstrations around the Saudi embassy, according to the state news agency IRNA.

Aftermath of storming, torching Saudi embassy in Tehran Diplomatic staff evacuate/d before storming, now all safe pic.twitter.com/SsSeU1bMtA — Sobhan Hassanvand (@Hassanvand) January 3, 2016

Meanwhile, local journalists have been reporting that the Saudi Arabia’s embassy staff will be evacuated out of Iran tonight.

Earlier, images of fire breaking out at the embassy building were shared on Twitter. A Mehr editor has reported a gas explosion, while photos from the scene show the building engulfed in flames.

Iran’s security forces had cordoned off the area around the embassy. Photos from the scene showed a heavy police presence.

Protesters gathered in several cities across Iran on Saturday angered by the Gulf kingdom’s execution of al-Nimr, who was put to death along with 46 other prisoners.

Nimr had been the most vocal critic of Saudi Arabia’s ruling family prior to mass protests that erupted in 2011. He called for regular demonstrations against the ruling elite. Shiites have long complained that they are victims of discrimination in the Sunni powerhouse. Nimr had often called for better protection for the country’s Shiite minority.

READ MORE: MidEast leaders lash out at Saudi Arabia over Shiite cleric's execution, protests erupt

Protesters in the city of Mashhad in northwestern Iran gathered on Saturday near the Saudi consulate, throwing Molotov cocktails at the building. Photos showed several protesters trying to climb the fence around the building. There were reportedly some clashes with police.

PHOTOS: Saudi consulate in Mashhad protected w/ fence, angry protesters at consulate over al-Nimr execution pic.twitter.com/3MxFFxMbXX — Sobhan Hassanvand (@Hassanvand) January 2, 2016

The predominately Shiite Iran has bashed Riyadh, accusing the Kingdom of supporting terrorism and executing its opponents. Iran said it has summoned the Saudi charge d’affaires in Tehran.

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“The Saudi government supports terrorists and takfiri [heretic] extremists, while executing and suppressing critics inside the country,” Foreign Ministry spokesman Hossein Jaber Ansari said, as cited by state news agency IRNA.

In the wake of the execution, Iranian lawmakers asked the Foreign Ministry to downgrade diplomatic ties with the Saudi government, FARS news agency reported. They proposed reducing the number of Saudi diplomats and consulates in Iran.

In turn, Saudi Arabia summoned the Iranian ambassador in Riyadh over Iran’s “hostile” remarks on executions, according to the state news agency SPA.

The ministry expressed “astonishment and its utter rejection of these hostile statements, which it deemed a blatant intervention in the kingdom’s affairs.”