NEWARK, N.J. – Staying quiet and behind closed doors for hours, jurors at U.S. Sen. Bob Menendez's bribery trial deliberated for a sixth full day Wednesday without reaching a verdict.

U.S. District Judge William H. Walls excused the panel of seven women and five men at 3:30 p.m., with instructions for them to return Thursday morning. They seemed tired as they appeared before Walls at the end of the day, but didn't ask the judge any questions.

On Monday, hours after one juror was replaced by an alternate, the panel had said it was deadlocked on all 18 charges filed against Menendez, a New Jersey Democrat, and his co-defendant, Salomon Melgen, a Florida eye doctor.

The senator is accused of accepting gifts from Melgen in exchange for advancing the doctor's personal and financial interests. The two men say their longtime friendship disproves the corruption charges – or at least creates reasonable doubt needed for an acquittal.