Jurors in the Kwame Kilpatrick corruption trial finished a second day of deliberations without reaching a verdict.
The jury has spent about 13 hours deliberating the fate of Kilpatrick, his father Bernard and contractor Bobby Ferguson.
A court spokesman on Wednesday said jurors sent a question to U.S. District Judge Nancy Edmunds regarding an extortion charge against Kilpatrick and Ferguson.
Jurors wanted to clarify a sewer-lining contract amendment referenced in Count #3 of the 38-count indictment.
In the charge, Kilpatrick and Ferguson are accused of extorting the Detroit firm Inland Waters out of approximately $175,000.
Edmunds addressed the question during a telephone conference with defense lawyers and prosecutors.
Deliberations continue at 9 a.m. Thursday in federal court and end at 4:30 p.m.