The jury in the Robert Doggart case failed to reach any verdicts after a day of deliberations.
The panel will return to the Federal Courthouse on Wednesday morning to resume talks.
Judge Curtis Collier said the foreman had a prior appointment from 10:30 a.m.-12:30 p.m., so the jury would be on recess during that time.
The jury began deliberations on Tuesday morning, then just before lunch asked to revisit some of the evidence.
Judge Collier told the jury they could sit in the courtroom and re-listen to the tapes they wanted to re-hear, while following along with a transcript.
Doggart, a former TVA engineer who lives in Sequatchie County just across the county line, is charged with two counts of making terroristic threats and two counts of soliciting others to take part in a campaign against a Muslim community in New York state.
The jury continued with its deliberation after the judge said it could not take transcripts of recordings back into the jury room.