SPOKANE--The City of Spokane's Prosecutor has dismissed charges against the only protestor to stand trial for actions related to last summer's 4th of July anti-police brutality protests in Riverfront Park.

KREM.com

Image from a Spokane Police video showing a protest in Riverfront Park on July 4, 2007.

20-year-old Michael Lyons was charged with resisting arrest and failure to disperse during the protest.

When his trial started on Monday, the Spokane Police Department revealed it had new video of the protest and arrests taken by a Spokane County Sheriff's deputy and a police officer that it had not given to the defense. The Police Department later revealed it also had documents that were not part of the prosecution case file.

In a statement, the City of Spokane said "while acknowledging that the documents themselves in no way diminish the strength of the City's case, the City Prosecutor has concluded that it no longer makes sense to continue to try the patience of the Court for misdemeanor charges."

The statement also described how the City Prosecutor worked with a police detective on the case because of the large number of arrests, which is something that doesn't normally happen. The City of Spokane said this unusual relationship helped contribute to "inadvertent omissions in the Prosecutor's case file."

Mayor Mary Verner has asked both the Chief of Police and the City Prosecutor to review their internal policies for future cases.

"I am disappointed that we are unable to move forward and present our case in court," said Chief Anne Kirkpatrick.

"Our police officers acted professionally and with restraint in the park last summer," said Mayor Verner. "Their actions were commendable on that day, and I'm sorry that we will not be able to proceed in court."