US-Iran war, July 20 -- Oil prices surged over 4% on Monday, with Brent crude crossing the $90-per-barrel mark, after the United States and Iran intensified their attacks in the Middle East, raising concerns over energy supplies through the Strait of Hormuz.

Brent crude futures rose $2.69, or 4%, to $90.79 a barrel, their highest level since June 11. The benchmark extended last week's rally, during which it gained 15.9%-its biggest weekly increase since April.

Meanwhile, US West Texas Intermediate (WTI) crude climbed $2.19, or 2.65%, to $84.68 a barrel, its highest level since June 12. WTI had advanced 15.5% last week, marking its strongest weekly gain since early March.

Iran said its ceasefire with the United States had effectively br...