All three major U.S. stock indexes turned lower, with Micron Technology (MU.O) falling nearly 3% after rising more than 4% earlier, SanDisk (SNDK.O) falling nearly 6%, and Nvidia (NVDA.O) falling more than 1% after rising more than 2%. In terms of news, Iran stated that substantial differences remain between the two sides, and U.S. officials said that Iran's latest proposal is insufficient to reach an agreement.