PORTLAND One man was charged Wednesday evening with shoving a Portland police officer into a moving TriMet bus during an 'Occupy Portland' march that crossed the Hawthorne Bridge.

David Anthony Burgess allegedly ran back into the crowd and was arrested after the parade was over, according to Sgt. Pete Simpson. The officer was not seriously injured.

Police reported that Wednesday night the tone of the march also changed in that marchers seemed to want a confrontation with police, Lt. Robert King said in a statement Thursday. The group marched against traffic and provoked motorists along the route. However, there continued to be many protesters who marched peacefully.

Live streaming video: Occupy Portland

March organizers were disappointed that the actions were tied to the Occupy Portland movement.

I think anytime violence is used against anybody that s not the message you re trying to send, said organizer Micaiah Dutt. And part of the deal with this occupy thing is we don t really have control of who comes in or who s going out.

Burgess was accused of assaulting a public safety officer, interfering with a police officer, disorderly conduct and harassment. He was scheduled to be arraigned Thursday afternoon.

Court documents revealed that Burgess had a criminal history in Utah, including a sexual battery conviction in 2008.

About 500 protesters started at Terry Schrunk Plaza just at 5:30 p.m. and walked to the city's east side around 7 p.m. across the Hawthorne Bridge and back over the Burnside Bridge.

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Simpson said it appeared conditions during rush hour traffic appeared dangerous, so police were trying to get protesters mostly on to sidewalks.

Officers were pulled from all precincts to handle the crowd. Participants declined to comply with police asking not to block traffic.

Some sat down on the bridge, but no arrests had been reported.

Officers prevented the marchers from getting onto the under-construction Morrison Bridge, so they headed up SE Grand and headed west on the Burnside Bridge around 7:30 p.m.

Organizers said this march was a show of support for a U.S. Marine veteran who was hurt while taking part in an Occupy Oakland rally last week.

Protesters who had set up camp in Schrunk Plaza were moved out by federal officers early Tuesday morning. Ten people were arrested.

More: Officers clear out Schrunk Plaza

The City of Portland has allowed protesters to remain camped in Lownsdale Square Park and Chapman Square.

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