A top Saudi official announced Sunday his country had cut ties with Iran over the torching of its embassy in Tehran by protesters angry at the execution of a prominent Shiite cleric. At a news conference, Foreign Minister Adel al-Jubeir said Iran's diplomats and all related personnel had been given 48 hours to leave the kingdom, according to Reuters. The tensions began in earnest after Saudi Arabia announced the execution of Sheikh Nimr al-Nimr on Saturday along with 46 others, including three other Shiite dissidents and a number of al Qaeda militants. It was largest mass execution carried out by the kingdom in three and a half decades. Al-Nimr was a central figure in protests by Saudi Arabia's Shiite minority until his arrest in 2012, and his execution was questioned around the world. Iran's Supreme Leader Ayatollah Ali Khamenei condemned the execution Sunday in a statement on his website, saying the Saudis were inviting "divine revenge" because al-Nimr "neither invited people to take up arms nor hatched covert plots. The only thing he did was public criticism." Iran's powerful Revolutionary Guard said Saudi Arabia's "medieval act of savagery" in executing the cleric would lead to the "downfall" of the country's monarchy. In Tehran, the crowd gathered outside the Saudi Embassy early Sunday 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, adding that the situation had been "defused." Iranian President Hassan Rouhani, while condemning Saudi Arabia's execution of al-Nimr, also branded those who attacked the Saudi Embassy as "extremists." "It is unjustifiable," he said in a statement.