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PORTLAND -- From deadly violence near Occupy Oakland this week to riots on the Portland State University campus 41 years ago, police and security experts are examining a wide range of scenarios as they plan to disband Occupy Portland's encampments this weekend.

Portland police chose to be open with protesters and educate them about time lines.

Background: Mayor gives 'Occupy' campers eviction notice

In Oakland, several surprise police raids have ended with violent confrontations at the occupy camp.

In May, 1970, violence erupted when police started ripping down tents set up at PSU by students protesting the shooting deaths of four Kent State students.

Derek Bliss manages private security officers for First Response Inc. which is protecting several banks and businesses near the occupy camp. He says Portland police are doing the right thing by communicating their intentions.

Video: Protesters 'occupy' PSU in 1970

It will wash out the people who are there to protest in a legal manner and then we'll know what we are dealing with and can take swift and corrective action, he said.

Bliss said his private officers were working with police and that large security forces would be ready over the weekend, just in case they are forced to take action.

More: Police remove concrete chucks from Occupy Portland camp

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