After "incidents" involving "extremely frustrated customers", BCBSNC beefs up office security. #SystemFailure pic.twitter.com/XP63uJVEOw — Joel Brown (@JoelBrownABC11) January 15, 2016

Blue Cross Blue Shield of North Carolina sent an email to employees saying they were increasing security and safety measures at their facilities due to incidents involving "extremely frustrated customers."An insider leaked the email to the ABC11 I-Team on Friday.The email sent to all employees stated the Durham, Chapel Hill, Winston-Salem, Fayetteville, and Charlotte police departments would be providing extra security at their buildings.A so-called "system failure" at BCBSNC enrolled thousands of customers in the wrong health insurance. Customers across the state complained of long wait times with customer service representatives and problems with their bills."We are taking these steps out of an abundance of caution," the health insurance company wrote. "We'll continue to assess our security needs and make any changes as circumstances warrant."BCBSNC employees: