The diplomatic crisis surrounding Saudi Arabia and Iran widened today as Kuwait recalled its ambassador to Tehran and Bahrain severed air links in the face of growing international concern. Joining Riyadh and its Sunni Arab allies in taking diplomatic action, Kuwait said it was withdrawing its envoy over a weekend attack on the Saudi embassy in Tehran.

Kuwait’s move came after the UN Security Council strongly condemned the attack, carried out by protesters angry over Saudi Arabia’s execution of a prominent Shiite cleric. Iran lashed out again at Saudi Arabia for the execution on Tuesday, with President Hassan Rouhani accusing Riyadh of seeking to cover its crime by severing ties.