In the wake of Saudi Arabia’s execution on Saturday of 47 prisoners convicted of terrorism charges, including a prominent Shiite cleric, protesters stormed the Saudi embassy in Tehran, breaking windows and setting it on fire.

Iranian journalist Sobhan Hassanvand tweeted photos and video from the scene early Sunday:

Iran’s semiofficial ISNA news agency confirmed protesters were angry over the execution of a Shiite cleric Sheikh Nimr al-Nimr. Iran’s parliament speaker warned that the execution would prompt “a maelstrom” in Saudi Arabia.

The Saturday night ISNA report said that the country’s top police official, Gen. Hossein Sajedinia, has rushed to the scene and police were working to disperse the crowd.

Al-Nimr was one of the leaders Saudi Arabia’s Shiite Muslim minority and was convicted for his role in multiple protests that turned violent. He remained a staunch critic of the ruling Al Saud family, but maintained that he never advocated violence.

The Associated Press contributed to this story.

This story has been updated.

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