The US embassies in some 10 Middle East countries on Saturday warned American citizens to exercise caution and "consider departing or be prepared to depart should there be escalation." US President Donald Trump on Friday threatened to hit Iran "very hard" as US media reported he was considering renewed heavy attacks as soon as this weekend, including against energy infrastructure targets, with Israel expected to join the campaign.

On the Iranian side, Iranian Foreign Minister Seyed Abbas Araghchi on Saturday warned the US against taking any "adventurous" actions, saying those responsible would bear the consequences, according to Iran's semi-official Mehr news agency.