President Joe Biden, his voice gripped with emotion, condemned the deadly attack against Israel by the Hamas militant group as "an act of sheer evil" and stressed U.S. support for Israelis mourning the slaughter of more than 1,000 people. A visibly upset Biden, in remarks at the White House, voiced concern for any Americans who may be held hostage by Hamas, the Iran-backed group that launched a surprise attack on Israel from Gaza on Saturday. At least 14 Americans died in the attack. National security adviser Jake Sullivan told reporters the U.S. believed 20 Americans were missing but that it...