Feds seek to renew delay in Massey investors' case

Last summer, U.S. District Judge Irene Berger issued an order that allowed prosecutors to keep secret the evidence they've been gathering in a continuing criminal investigation of the Upper Big Branch mine disaster.

Investors led by the Massachusetts Pension Reserves Investment contend that Massey repeatedly lied about its safety record, artificially inflating stock prices between 2008 and 2010. They say shareholders had no idea of the company's abysmal record and history of violations until after the southern West Virginia mine exploded, killing 29 men in April 2010.