On Wednesday Britain's maritime agency warned that increased tensions in the Middle East might lead to an escalation in military activity that could impact shipping in critical waterways. It advised vessels to use caution while travelling through the Gulf, the Gulf of Oman and the Straits of Hormuz, which all border Iran.

"I am pleased to confirm the 6th round of Iran US talks will be held in Muscat this Sunday the 15th," Bad Albusaidi, the country's foreign minister said on social media.

The risk of conflict is growing as Iran signals strikes on Israeli nuclear facilities despite ongoing nuclear talks.

With Israel apparently poised to attack Iran, the U.S. government warns staff in Israel to restrict travel and clears service members' families across the Mideast to evacuate.

U.S. embassies and military bases across the Middle East are on high alert, as fears grow about and Israeli strike on Iran.