Witnesses say some 400 protesters have gathered at the Saudi Embassy in Tehran after it was stormed overnight.
Authorities had told demonstrators not to protest in front of the embassy and instead gather at a square in central Tehran. The 400 protesters apparently disregarded that, shouting: "Death to Al-Saud!"
Meanwhile, the road the embassy sits on in northern Tehran saw a new street sign come up in recent hours. Instead of saying "Boustan" or "park" in Farsi, it now reads "Sheikh Nimr St." in honor of the Shi'ite cleric that Saudi Arabia executed on Saturday.
Tehran authorities could not be immediately reached for comment about the apparent name change for the street.
Saudi Arabia executed Sheikh Nimr al-Nimr on Saturday along with 46 others convicted on terror charges, including three other Shi'ite dissidents and a number of al-Qaida militants.
Al-Nimr was an outspoken critic of Saudi Arabia's Sunni monarchy but denied ever calling for violence. His execution has sparked outrage among Shi'ites across the region.
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