Four Americans, including a pair of siblings from New York and a couple from Kentucky and Tennessee, respectively, are missing after the coordinated bombings in Brussels on Tuesday. Siblings Sascha and Alexander Pinczowski reportedly called their family from Brussels Airport on Tuesday—but there was an explosion and then the line went dead. Family members have posted on Facebook that they haven't heard from them since. Stephanie Shults and her husband, Justin, live in Brussels and were last seen in the departure area of the airport. Justin, a Tennessee native, and Stephanie, a Kentuckian, moved to the city in 2014. So far, at least eight Americans have been declared injured in the attacks, including a U.S. service member and four of his family members in addition to three Mormon missionaries.