Saudi King Salman stands next to Turkish President Tayyip Erdogan during a welcoming ceremony upon Erdogan’s arrival in Riyadh.

Turkey’s foreign ministry on Tuesday expressed concern over mounting tensions between Saudi Arabia and Iran following the execution of a Shi’ite preacher, calling for calm and a return to diplomatic language.

“Turkey calls for an end to threats, and a return to diplomatic language, and urges mutual caution,” a statement from the ministry said.

Saudi Arabia cut all ties with Iran on Sunday following the kingdom’s execution of Nimr al-Nimr. It has said it will only restore them when Tehran stops meddling in the affairs of other countries.

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