major questions how hackers or cyber terrorists cracked into a company on u.s. soil. as we all know, sony caved to their demands but this is not the first company that has been targeted. less than a year ago another major american company was hacked and our brian todd has that story. >> reporter: a cascading attack, servers shut down, screens go blank, a rush to unplug computers. this wasn't the hack on sony, this was this attack hit the world's largest casino operation, including the venetian hotel in las vegas ten months ago. and this also may have been the work of a rogue nation. cnn has learned on february 10 of this year thousands of employees at sands casinos in las vegas and bethlehem, pennsylvania, had their computers hit.