The Arizona grand jury that recently indicted 18 people for their roles in former President Donald Trump’s scheme to subvert the 2020 election cast a far wider net than state prosecutors had publicly foreshadowed.

The panel of 16 Arizonans displayed unusual independence from the prosecutors supervising the investigation, according to a rare inside look at the secret proceedings based on interviews with eight people familiar with the probe and documents signed by a top prosecutor.

The grand jury took aggressive steps to haul in witnesses and even brought charges against some who had been told by prosecutors they were not under investigation. It ultimately produced a 58-page indictment last month that charged national and state Republicans — including one of Trump’s current top advisers and several former members of his inner circle — with felonies for their alleged roles in the effort to overturn Joe Biden’s victory in the state. Trump himself was listed as an unindicted co-conspirator.