BP oil well "dead" 5 months after spill began

The blown-out well at the heart of the worst oil spill in U.S. history has been cemented shut and is "effectively dead," the federal government's point man for the disaster said Sunday. "Additional regulatory steps will be undertaken but we can now state, definitively, that the Macondo well poses no continuing threat to the Gulf of Mexico," former Coast Guard Adm. Thad Allen announced.