By Trevor Hunnicutt and Parisa Hafezi A U.S. official said there was continued engagement with Iran, and forward motion on trying to get to an agreement. Pakistani Prime Minister Shehbaz Sharif also said efforts were still under way to resolve the conflict. But oil prices climbed back to $100 per barrel, with no sign of a swift reopening of the Strait of Hormuz to ease the biggest ever disruption ...