Hundreds of Shi’ite Muslims protested in Tehran on Sunday against Saudi Arabia’s execution of prominent Shi’ite cleric Nimr al-Nimr.<br /><br /> Demonstrators chanted “death to Al-Saud” royal family as well as the US and Israel that they say support the kingdom. <br /><br /> Iran’s supreme leader Ayatollah Ali Khamanei condemned Saudi Arabia for the second day on Sunday. He said the cleric’s blood “will catch up with them without any doubt.”<br /><br /> The two regional rivals were already at odds with each other over an ongoing conflict in Yemen where Saudi-led fighters are battling against the Iran-backed Houthi rebel movement. <br /><br /> Al-Nimr was an outspoken and long-standing critic of what he described as the Saudi government’s discriminatory policies against the Shi-ite minority. <br /><br /> He was executed on Saturday along with three other Shi’ites and dozens of Sunni jihadists.