Saudi Arabia announced the execution of Sheikh Nimr al-Nimr yesterday along with 46 others, including three other Shiite dissidents and a number of al-Qaida militants.
Al-Nimr was a central figure in protests by Saudi Arabia's Shiite minority until his arrest in 2012, and his execution drew condemnation from Shiites across the region.
Iran's Supreme Leader Ayatollah Ali Khamenei condemned the execution today in a statement on his website, saying al-Nimr "neither invited people to take up arms nor hatched covert plots. The only thing he did was public criticism."
The statement, carried by the official Saudi Press Agency, accused Tehran of "blind sectarianism" and said that "by its defence of terrorist acts" Iran is a "partner in their crimes in the entire region."
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Al-Nimr was convicted of terrorism charges but denied ever advocating violence.
Sunni Saudi Arabia and Shiite Iran are locked in a bitter rivalry, and support opposite sides in the wars in Syria and Yemen. Iran accuses Saudi Arabia of supporting "terrorism" in part because it backs Syrian rebel groups, while Riyadh points to Iran's support for the Lebanese Hezbollah and other Shiite militant groups in the region.
In Tehran, the crowd gathered outside the Saudi embassy early today and chanted anti-Saudi slogans. Some protesters threw stones and Molotov cocktails at the embassy, setting off a fire in part of the building, said the country's top police official, Gen Hossein Sajedinia, according to the semiofficial Tasnim news agency. He later said police had removed the protesters from the building and arrested some of them, saying the situation had been "defused."