U.S. equity futures opened lower on Sunday, following coordinated attacks in Paris on Friday that killed more than 130 people. The attacks unfolded after markets closed in the United States, but equity futures added to losses in light volume in after-hours Friday trading after reports hit the news and images were shared on social media. Analysts expected a so-called run to safety as a knee-jerk reaction to the uncertainty caused by the attacks, and the slide in equity futures partly confirmed expectations.