Let me be clear: Iran should not target U.S. interests or personnel." U.S. stock futures are dropping, with Dow Jones Industrial Average and Nasdaq futures 1.1% lower, and S&P 500 futures down 1.4%.

Futures on the Dow Jones Industrial Average (DJIA) are up 71 points ahead of the open, while S&P 500 Index (SPX) and ...

As of 11:57 p.m. ET, the Nasdaq 100, S&P 500 and Dow futures fell over 30% each, while the Russell 2000 Index lost about 0.50%.