Hackers Delete 30 Million Files From California Transit System, Demand 1 Bitcoin

A student from an engineering school attends the first edition of the Steria Hacking Challenge., in Meudon, west of Paris, on March 16, 2013. Thomas Samson/AFP/Getty Images

A regional transit system in California was imperiled by a hacker—or hackers—who deleted 30 million files and took the computer systems down.

The attack forced Sacramento Regional Transit to halt its operating systems that take credit card payments and assign buses and trains to routes, CBS Sacramento reported.