(Reuters) – JPMorgan Chase Co said it had not seen any unusual customer fraud related to a recent cyber attack on the bank. Chase customers will not be liable for unauthorized transactions on their account provided they promptly alerted the bank, it said in a filing. (http://1.usa.gov/1wi92qX) JPMorgan said last month it was investigating a possible cyber attack and working with law enforcement authorities to determine the scope. (Reporting by Anil DSilva in Bangalore; Editing by Saumyadeb Chakrabarty)