With a press release about a planned "anti-police" protest tonight by Occupy Portland, the Portland Police Bureau probably did more to publicize the event than the Occupiers themselves. 

New York Times
The corporate state understands and welcomes the language of force. It can use the Black Bloc’s confrontational tactics and destruction of property to justify draconian forms of control and frighten the wider population away from supporting the Occupy movement. Once the Occupy movement is painted as a flag-burning, rock-throwing, angry mob we are finished. If we become isolated we can be crushed.

Update Feb. 7: Portland police report making 10 arrests at last night's protest. 

An Occupy Portland PR committee recap says the protest was "not officially an Occupy Portland event," and that Occupy "is a non-violent movement and has not engaged in violence or property destruction during its four months of existence… The only violence during the evening was committed by the Portland Police Bureau who responded violently during the march."