As the death toll in Gaza continues to grow amid Israel’s punishing bombardment of the Strip, so too does another statistic: the missing children. To date, at least 21,000 children are missing amid the chaos of the war, according to a new report by Save the Children—a figure the charity says includes 17,000 children who are unaccompanied or separated from their families as a result of the war and the 4,000 children who are thought to be missing under the rubble, as well as the untold number of children who have either been detained by Israeli forces or have been recently discovered in mass graves.