OAKLAND -- An Occupy Oakland member who smashed a front display window at the police department's recruiting and internal affairs office near City Hall last year was found guilty this week of felony vandalism.

Cesar Aguirre, 24, of Elk Grove, caused more than $6,000 in damage to the office on Frank Ogawa Plaza when he smashed a metal folding chair several times into the front windows, evidence in the case revealed.

Once the windows were broken, Aguirre used his body to push against wooden boards behind the window in attempt to gain entry into the office, the evidence showed.

According to the Alameda County District Attorney's Office, Aguirre was wearing black clothing, goggles and a dust mask during a protest on Nov. 2, 2011 when he caused the damage.

Aguirre broke six windows and a door, evidence showed.

He faces 16 months in jail when he is sentenced next month.

Aguirre is also being sued in civil court by the City of Oakland, which is attempting to recover monetary and punitive damages.