Jurors deliberating fraud and racketeering charges against former media mogul Conrad Black and three associates adjourned on Wednesday without announcing a verdict, saying only they would return on Thursday.

The jury gave no hint as to their progress a day after issuing a cryptic note saying they were deadlocked on one or more charges contained in the complex 42-count case.

On Tuesday, presiding Judge Amy St Eve of US District Court issued instructions to the jury and sent them back to resume discussions.

After soliciting their opinions, she denied requests from defence lawyers and prosecutors to have the 12-person jury reveal whatever verdicts, if any, it had reached.

Black, 62, and three other former executives at Chicago-based Hollinger International Inc are accused of operating a scheme that absconded with $60 million as they dismantled the one-time media giant, since renamed Sun-Times Media Group.

The jury began deliberating after midday on June 27, at the conclusion of the 15-week trial.