U.S. official: Attack on Saudi oil facilities was launched from southern Iran

A senior U.S. official tells CBS News national security correspondent David Martin that the U.S. has identified the exact locations from which a combination of more than 20 drones and cruise missiles were launched against Saudi Arabian oil facilities. Martin spoke to CBSN's Elaine Quijano on "Red and Blue," along with CBS News White House correspondent Ben Tracy and Washington Post White House reporter Anne Gearan.