The US Supreme Court says Bernard Ebbers, former chief executive officer at WorldCom, will remain in prison to serve out his 25-year sentence.

The court turned down an appeal by Ebbers yesterday without comment. The appeal was based on Ebbers' belief he did not receive a fair trial because potential defence witnesses were not offered immunity as were prosecution witnesses.

In July, Ebbers had to report to prison after a US Court of Appeals upheld his original conviction , which was handed down in September 2005.