The conflict in the Middle East may have taken another turn as a fire at the US embassy in Saudi Arabia was reported, as loud explosions were heard and clouds of smoke were seen.
President Trump also declined to rule out sending ground troops into Iran as the conflict spread into the Gulf countries and Lebanon and Israel exchanged strikes.
Gas and oil prices soared on Monday as attacks by Iran across the Middle East choked off supply and threatened a painful financial squeeze on UK households and motorists.