Martinez, 45, immediately checked her bank statements for the credit card linked to her loyalty account. There, she learned that the largest casino owner in Las Vegas had fallen victim to a cybersecurity breach. That's odd, she thought, then toggled over to Facebook to search for clues about the issue on a group for MGM Resorts International loyalty members. LAS VEGAS - A persistent error message greeted Dulce Martinez on Monday as she tried to access her casino rewards account to book accommodations for an upcoming business trip.
