Jury pool of 9,000 arrive for ‘Batman’ killings trial

Some 9,000 prospective jurors — the largest jury pool in US history — began arriving for the Batman cinema shooting trial.

Whittling those numbers down to the 12 jurors and 12 reserves is expected to take months, and the trial at the court in Centennial, in Denver, Colorado, could last until October.

At first glance, the case seems simple, as James Holmes has confessed to the attack that left 12 dead and 70 injured. But jurors must decide whether he was insane when he opened fire on movie-goers in July 2012.