Flames rise from Saudi Arabia"s embassy during a demonstration in Tehran January 2, 2016.
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Protesters storm Saudi embassy in Tehran

Unverified footage posted on social media appears to show part of the Saudi Embassy in Tehran under attack and on fire.

Unverified footage posted on social media appears to show part of the Saudi Embassy in Tehran under attack and on fire.

Protests in the Iranian capital follow the execution of a prominent Shia cleric, Sheikh Nimr al-Nimr, in Saudi Arabia.

Iran's supreme leader Ayatollah Ali Khamenei described Sheikh Nimr as a "martyr" who acted peacefully, and warned Saudi Arabia will face "divine revenge".