One of the officers plans to enter a guilty plea for falsifying an affidavit and lying to federal investigators.
Officials are offering a $2500 reward for information that leads to the arrest and conviction of the vandals.
Divisions within the protest community over tactics and action were laid bare in Portland and Seattle.
Myles Cosgrove and Joshua Jaynes join Brett Hankison, who was fired in June and criminally charged.
An art installation on Seattle's Capitol Hill highlights police brutality on the walls and barricades of the East Precinct.