oil prices rose again Tuesday hitting fresh six month holidays off to the U. S. tighten sanctions on Iran international benchmark Brent crude up above seventy four dollars in early trade , a day earlier Washington had said it was in the old waivers for countries buying Iranian oil we are going to zero we how long we remain there at zero depends solely on the Islamic Republic around senior leaders , secretary of state Hey %HESITATION said countries must stop buying Iranian crude by may first or face sanctions eight nations including China and South Korea had previously been allowed to keep falling now the White House says it is working with Saudi Arabia and the UAE to insure the market is adequately supplied but traders had already been worried about tight supplies meeting the new move was sure to provoke a price spike the news had a mixed impact on stocks crude produces like shell and BP up close to two percent early Tuesday she says it will depend on phones like airlines headed the other way of of the overall sentiment on equity markets was cautious as traders focused on signs that China to dial back on economic stimulus measures