Israel and Iran continued to trade fire yesterday, with Iranian drone and missile barrages setting off sirens across Israel and hitting ports in Dubai and Oman. At least 45 people were reported killed yesterday across the region.

Safe‑haven gold steadied on Monday as profit‑taking set in after prices ‌earlier jumped more than 2% in response to concerns of a prolonged conflict in the Middle East following U.S. and Israeli strikes against Iran.

More than 100,000 Britons have registered for UK government help in Middle East. In response, Iran has fired missiles at Israel, and other nearby countries that have ties with the US like Bahrain, Qatar, Kuwait and the United Arab Emirates. These are often known as Gulf states.

Gas prices could rise 25-50 cents per gallon as Middle East tensions threaten global oil supplies after strikes on Iran killed Supreme Leader Khamenei.

Plans for the biggest mass evacuation in a generation are being drawn up to rescue thousands of British nationals left stranded by US-Israeli strikes on Iran.

The war is likely to disrupt oil supplies from Iran and elsewhere in the Middle East. Attacks throughout the region, including on two vessels traveling through the Strait of Hormuz, the narrow mouth of the Persian Gulf, have constrained oil exports to the rest of the world.

Follow NBC News' live coverage as the U.S. and Israel attack Iran, Tehran hits back across the Gulf and Hezbollah strikes from Lebanon while Iran chooses a new supreme leader after the killing of Ayatollah Ali Khamenei.