At this writing, the answer is 9,000.
It is for the trial of James Holmes accused of the 2012 attack at an Aurora, Colorado, movie theater that left twelve dead and many injured. So far, there have been several incidences involving potential jurors, and jury selection is expected to last for several months.
There were 3,000 summoned for the trial of accused Boston Marathon bomber Dzhokar Tsarnaev, and 1,000 summoned for the 1994 O.J. Simpson trial.
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