Tehran vowa to respond after USS Spruance fires on Iranian-flagged cargo ship allegedly running strait of Hormuz blockade. Key US politics stories from Sunday 19 AprilAmerica’s benchmark oil contract West Texas Intermediate (WTI) surged late on Sunday after Iran accused the US of having broken a c easefire in place since early April.WTI crude was trading up 7.5% at $90.17 per barrel by 8pm ET, while international oil benchmark Brent North Sea crude gained 6.%5 to $96.27 per barrel. Continue reading... ...read more read less