Iran has warned the US that any action against it after an attack on Saudi oil installations will “immediately” be met with a response from Tehran, its state-run news agency has reported.

Axar.az reports citing IRNA that Iran’s president and foreign minister also may skip next week’s high-level meetings at the United Nations as the US has yet to issue them visas.

The UN meeting had been considered as an opportunity for direct talks between Iranian President Hassan Rouhani and President Donald Trump amid a summer of heightened tensions and attacks after America’s unilateral withdraw from Iran’s nuclear deal with world powers a year ago.

However, the attack in Saudi Arabia and hardening comments from Tehran suggest such talks are increasingly unlikely.