The Los Alamos, N.M., National Laboratory reportedly breached national security by sending classified nuclear weapons information over the Internet.

The e-mails resulted in “the loss of control of top-secret restricted data,” Reps. John Dingell and Bart Stupak, both Michigan Democrats, wrote Thursday to U.S. Energy Secretary Samuel Bodman.

Several Los Alamos officials in January used open e-mail networks to share classified information on the characteristics of nuclear material used in weapons, Dingell and Stupak wrote.

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