JPMorgan Chase trader Frederick Reimer works on the floor of the New York Stock ExchangeBy means of David Henry and Jim Finkle NEW YORK/BOSTON (Reuters) – JPMorgan Chase & Co is warning some 465,000 holders of pay as you go cash playing cards issued by the bank that their private knowledge will have been accessed by using hackers who attacked its network in July. The playing cards had been issued for corporations to pay staff and for government agencies to issue tax refunds, unemployment compensation and other advantages. JPMorgan mentioned on Wednesday it detected that its internet servers utilized by its website www.ucard.chase.com had been breached in the course of September. Financial institution spokesman Michael Fusco said that within the months since the breach was once revealed the financial institution has been investigating to search out out precisely which bills have been involved and what pieces of data may have been taken.