** Shares of insurer Aflac AFL.N fall 1.1% to $101.50 premarket
** Co says it identified suspicious activity on its network in the United States on June 12
** AFL says files contain personal information of its customers, including social security numbers and health-related details
** Co says it has reached out to third-party cybersecurity experts to investigate the incident and has commenced a review of potentially impacted files
** Up to last close, stock had fallen 0.8% YTD
(Reporting by Puyaan Singh)
((Puyaan.Singh@thomsonreuters.com;))