US stock futures have seen a slide in early trading on Sunday evening US time, as a credit rating downgrade of the world's largest economy by Moody's has hit sentiment. The Dow futures are down 280 points,

U.S. stock futures point to a lower open after Moody's stripped the U.S. of its top credit rating. Moodys cut its credit rating on Friday a notch to Aa1 from Aaa due to likely difficulty financng the federal government’s growing budget deficit and the ramifications of rolling over existing U.