OAKLAND -- A crowd of as many as 100 protesters marched through downtown Friday, breaking car windows and a window at Barack Obama's local campaign office.

Officer Johnna Watson, a spokeswoman for the Oakland police, confirmed in an email that a window of Obama's campaign office at 16th Street and Telegraph Avenue was smashed.

Police also confirmed that several car windows were broken. The protesters began organizing about 9 p.m. and marched up Broadway.

Police also said they were following the protesters during the march.