Brent crude up by more than 3% after latest fire between US and Iran in Gulf and Houthi attacks on Saudi citiesBusiness live – latest updatesThe price of oil has risen above $100 a barrel for the first time since July as the escalating conflict in the Middle East threatens further disruption to global supplies.Brent crude, the international benchmark for oil prices, rose by more than 3% to top $101 after tensions increased in the Gulf amid the latest tit-for-tat exchange of fire between the US