Oman’s Foreign Minister Yusuf bin Alawi bin Abdullah attends a meeting for Gulf states Foreign Ministers in Riyadh.

Oman on Wednesday said it regretted the “unacceptable” attacks on Saudi missions in Iran, after some Gulf nations downgraded diplomatic ties.

The Omani reaction comes four days after protesters torched Riyadh’s embassy and its consulate in Iran over Saudi Arabia’s execution of Sheikh Nimr al-Nimr, a prominent Shiite cleric accused of fomenting sedition in the kingdom.

The sultanate “expressed its deep regret” over the attacks, which it described as “unacceptable” in a foreign ministry statement published by the official ONA news agency.

Oman stressed the “need to find new rules that prohibit any form of interference in the internal affairs of other countries.”

The sultanate is known for its historically strong ties with Iran but is also a member of the six-nation Gulf Cooperation Council (GCC), led by regional heavyweight Saudi Arabia.

Media reports in Tehran said Oman’s foreign minister was expected in the Iranian capital on Wednesday.

The assaults on its missions prompted Riyadh on Sunday to break off diplomatic ties with Iran and order its diplomats to leave the kingdom. Saudi allies Bahrain and Sudan have followed suit and the United Arab Emirates downgraded its ties with Tehran.

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