The Syrian volunteers who risk their lives to save others

Once tailors, bakers, pharmacists, some 3,000 ordinary Syrians are now the unwitting heroes of the Syrian war. Nicknamed "the White Helmets," members of the Syrian Civil Defense work under the harshest conditions to claw through the remains of buildings flattened by barrel bombs, the Syrian regime's weapon of choice. Special correspondent Marcia Biggs reports from Turkey.