Gold prices have risen as investors assess the impact of the Middle East conflict ahead of central bank policy decisions. Spot gold firmed 0.4% to $5,023.19 per ounce as of 0251 GMT, and U.S. gold futures for April delivery rose by 0.5%. However, oil prices remained above $100 a barrel due to the U.K.-Israeli war against Iran, resulting in the biggest disruption to global supplies on record. The Federal Reserve is expected to maintain its current policy at a meeting on Wednesday. If the central bank strikes a relatively hawkish tone, gold may weaken.