JPMorgan Chase & Co is investigating a possible cyber attack and working with law enforcement authorities to determine the scope, a company spokeswoman said on Thursday morning. The bank was taking additional steps to safeguard sensitive or confidential information, though it did not see unusual fraud activity at this time, company spokeswoman Trish Wexler said. JPMorgan disclosed the investigation after the FBI said Wednesday evening it was investigating media reports earlier in the day that several U.S. financial companies have been victims of recent cyber attacks. "We are working with the United States Secret Service to determine the scope of recently reported cyber attacks against several American financial institutions," FBI spokesman Joshua Campbell said in a statement late Wednesday. Campbell did not name any companies or give more details, although media reports had named JPMorgan as one victim of the attacks. Other potential victims have yet to be named. Officials with the Secret Service could not be reached for comment.