New twists in the sonar search for Flight 370

The Bluefin-21 completed 90% of its sweep of the Flight 370 search zone. But finishing the job could take longer than expected. That's raising new questions about how the search is being conducted. This comes as doubts grow about whether a piece of debris that washed up on an Australian beach may be from the missing plane. Miguel Marquez has the latest from that beach.

Michael Holmes has the latest on the sonar search from Perth, Australia.