The latest developments after Saudi Arabia severed diplomatic ties with Tehran amid a dispute over Riyadh's execution of an opposition Shiite cleric and attacks on Saudi diplomatic posts in Iran. (All times local).

3:40 p.m.

Iranians have rallied against Saudi Arabia to protest the kingdom putting to death Shiite cleric Sheikh Nimr al-Nimr, an execution that sparked regional protests and tensions.

Thousands of worshippers who took part in Friday prayers in Tehran joined the rally, carrying pictures of al-Nimr and chanting "Death to Al Saud," referencing the kingdom's royal family.

Iranian state media reported similar protests taking place in other Iranian cities and towns.

Saudi Arabia severed ties with Iran on Sunday after crowds of protesters attacked two of its diplomatic posts in Iran. Those attacks came after Saudi Arabia executed al-Nimr on Jan. 2.

The escalating tensions between the two adversaries may imperil efforts to end the wars gripping Syria and Yemen, where Saudi Arabia and Iran back rival sides.