President Biden on Monday announced that the number of Americans killed in terrorist attacks against Israel had risen to 11, and he warned that American citizens may be among those being held hostage by the militant group Hamas. “As we continue to account for the horrors of the appalling terrorist assault against Israel this weekend and the hundreds of innocent civilians who were murdered, we are seeing the immense scale and reach of this tragedy,” Biden said in a statement. “Sadly, we now know that at least 11 American citizens were among those killed — many of whom made a...