A published report says Federal authorities plan to arrest two former JPMorgan Chase & Co. employees on suspicion that they tried to conceal the size of the investment bank's $6 billion trading loss last year.

The New York Times reported Friday that the arrests of Javier Martin-Artajo and Julien Grout are expected to occur in London in coming days, citing unnamed persons briefed on the matter.

Martin-Artajo oversaw JPMorgan's trading strategy in London, while Grout recorded the value of the soured investments, the newspaper reported.

A federal grand jury voted to indict both on criminal fraud charges, according to the report.

The U.S. attorney's office in New York declined to comment late Friday.

A call left with the FBI office in New York was not immediately returned.