Battle for Mosul over, but hidden ISIS danger could lurk for years

Iraq may have ousted Islamic States militants from the city of Mosul over the summer, but the major task of finding and destroying the mines, booby traps and bombs remains. A security firm hired by the U.S. and Iraqi workers are making progress to clear major areas, but it could take years or even decades. Special correspondent Marcia Biggs reports on the safety of Mosul after ISIS.