MIAMI -- The jury in the trial of the so-called "Liberty City Seven" has begun its eighth day of deliberations.

Twice the jury has sent notes saying they were unable to decide the fate of the seven men who are accused of plotting to blow up the Sears Tower in Chicago and bomb FBI buildings in Miami and elsewhere, Local 10's Rad Berky reported.

Judge Joan Lenard on Monday read the jury what is called the "Allen Charge," urging the members to think about their arguments. If they are unable to reach a verdict, Lenard told them, "The case will be left open and may have to be tried again."

The seven men charged were all caught on FBI surveillance video pledging support to al-Qaida, but the man leading the pledge was an FBI informant. The defense claims the men were just hoping to get money from the informant and had no intention of going ahead with the alleged plot.

They face up to 70 years in prison if convicted of four terror-related conspiracy charges.