Oman's foreign minister, who had been mediating US-Iran talks, on Sunday urged a ceasefire on a call with his Iranian counterpart, as Tehran launched a second day of strikes in response to ongoing US-Israeli air raids.

Badr Albusaidi "affirmed the Sultanate of Oman's continued call for a ceasefire and a return to dialogue... in a manner that achieves the legitimate demands of all parties," Oman's foreign ministry said in a readout of a call with Iran's foreign minister Abbas Araghchi.

On Sunday in Oman, which had been the only Gulf state spared from attack during the first day of the Iranian campaign, the port of Duqm was targeted by two Iranian drones, injuring one foreign worker, official state media reported.

According to the Oman foreign ministry statement, Araghchi said Iran was "calling for peace," and voiced "the openness of the Iranian side to any serious efforts that contribute to stopping the escalation and returning to stability."