Iran's Islamic Revolution Guards Corps launched late Saturday night a "large-scale combined offensive operation" against Israel, while the Israeli military said on Sunday morning it has completed a large-scale wave of attacks in Tehran that targeted infrastructure related to the Iranian nuclear program and fuel storage facilities.  

A round of U.S.-Iran nuclear talks that was due to be held in Oman on Sunday was canceled, with Iranian Foreign Minister Seyed Abbas Araghchi saying the discussions could not take place while Iran was being subjected to Israel's "barbarous" attacks. 

Iran said 78 people were killed on the first day of Israel's campaign on June 13, and scores more on the second, including 60 when a missile brought down a 14-storey apartment block in Tehran, while Israeli authorities said four people have been killed in Israel and dozens injured by Iranian strikes.  

Fears about potential disruption to the region's oil exports had already driven up oil prices 9 percent on Friday, as an Iranian general, Esmail Kosari, said on Saturday that Tehran was reviewing whether to close the Strait of Hormuz controlling access to the Gulf for tankers.  

Chinese Foreign Minister Wang Yi held phone calls with Iranian Foreign Minister Seyed Abbas Araghchi and Israeli Foreign Minister Gideon Sa'ar respectively, expressing China's willingness to continue to play a constructive role in de-escalating the situation.