South African nuclear facility: An inside job?

60 Minutes' Scott Pelley interviews Ploughshares Fund grantee Matthew Bunn of Harvard University's Managing the Atom project about a terrifying and mysterious attack a year ago on the Pelindaba nuclear facility in South Africa.  Two teams of gunmen gained access to the plant, which houses enough highly-enriched uranium to fuel a dozen nuclear bombs, but were repelled by t wo alert guards who fought them off.  The attackers got away.  A random burlary attempt?  Bunn doesn't think so. "These people knew what kind of site they were in and knew what they were doing."  Watch the video here.