The fallout from the hack that began four weeks ago exploded Tuesday after the shadowy group calling themselves Guardians of Peace escalated their attack beyond corporate espionage and threatened moviegoers with violence reminiscent of the terrorist attacks of September 11, 2001. The Department of Homeland Security said there was "no credible intelligence to indicate an active plot against movie theaters," but noted it was still analyzing messages from the group, dubbed GOP. [...] two former Sony film production workers filed lawsuits alleging the Culver City, California company waited too long to notify nearly 50,000 employees that data such as Social Security numbers, salaries and medical records had been stolen. Neither Sony nor representatives from individual theater chains, including Carmike, responded to requests for comment. Since the hack surfaced late last month, everything from financial figures to salacious emails between top Sony executives has been dumped online. The nearly 32,000 emails to and from Sony Pictures Entertainment CEO Lynton leaked Tuesday include information about casting decisions and total costs for upcoming films, release schedules for Sony films through 2018 and corporate financial records, such as royalties from iTunes, Spotify and Pandora music services. The emails also include banal messages about public appearances, tennis matches, home repairs, dinner invitations and business introductions.