"The unjustly spilt blood of this martyr will have quick consequences," Khamenei told clerics in the capital, referring to Nimr al-Nimr who was executed along with 46 other men on Saturday.
'Serious concerns' over Saudi's execution of Shia cleric: EU
"This scholar neither encouraged people into armed action nor secretly conspired for plots but the only thing he did was utter public criticism rising from his religious zeal."
Khamenei called the killing of Nimr "a political mistake by the Saudi government". "God will not forgive... it will haunt the politicians of this regime," he added.
Angry crowds in Iran set fire to the Saudi embassy and consulate late Saturday night, with officials saying on Sunday that 40 people had since been arrested over the attack. The strongest condemnation came from Riyadh's longtime rival Tehran.
"The Saudi government supports terrorist movements and extremists, but confronts domestic critics with oppression and execution," Iranian foreign ministry spokesman Hossein Jaber Ansari said. It will "pay a high price for following these policies", he warned.
Saudi foreign ministry spokesperson Mansur al-Turki called Iran's reaction "irresponsible", and Riyadh summoned Tehran's envoy in protest.
1,000 demand release of Saudi death row Shias
The demonstrators in Tehran hurled petrol bombs and stormed the Saudi embassy before being cleared out by police. Flames could be seen rising from the building. "The fire has destroyed the interior of the embassy," an eyewitness told AFP, speaking on condition of anonymity.
Some of the "rogue elements" entering the embassy were arrested, Tehran police chief Hussein Sajedinia told ISNA news agency. Riyadh said the executed men had been convicted of adopting the radical "takfiri" ideology, joining "terrorist organisations" and implementing various "criminal plots".
Iran president says Saudi embassy attack 'totally unjustifiable'
Iran's president Sunday condemned the Saudi execution of a Shia cleric but also denounced attacks on the Sunni kingdom's embassy and consulate as "totally unjustifiable" after protesters stormed the compounds.
"The actions last night by a group of radicals in Tehran and Mashhad leading to damage at the Saudi embassy and consulate are totally unjustifiable, as the buildings should be legally and religiously protected in the Islamic Republic of Iran," Hassan Rouhani said, quoted by the official IRNA news agency.
Iran says 40 arrested over Saudi embassy attack
An Iranian official said 40 people have been arrested after Saudi Arabia's embassy was attacked and set on fire following outrage at the kingdom's execution of a Shia cleric.
Saudi embassy attacked in Tehran: news agency
The suspects were identified and arrested and other detentions could follow, Tehran prosecutor Abbas Jafari Dolatabadi was quoted by the ISNA news agency as saying.
COMMENTS (2)
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ