Nuclear weapons lab's keys are lost

A U.S. nuclear weapons laboratory must replace up to 100,000 locks at a cost of more than $1.6 million, after staff lost several sets of master keys to the complex, then failed to notify superiors, it emerged Friday.

The extraordinary series of security blunders at the Lawrence Livermore National Laboratory is outlined in a scathing report by the U.S. Energy Department's inspector general.