[JURIST] A federal grand jury has issued 31 new indictments against five former Enron [JURIST news archive] executives, five months after their original case ended in acquittal and mistrial [JURIST report]. Among those facing charges are Joseph Hirko, the former co-chief executive of Enron Broadband Services, and Rex Shelby, a technology executive, who face a total of 13 charges [indictment, PDF], including security and wire fraud and insider trading. The remaining executives will be tried separately. Hirko and Shelby's trial is expected to begin next September 5. Reuters has more. The Houston Chronicle has local coverage.