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Chicago NATO Protesters, Police Clash Downtown (VIDEO)

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An anti-NATO protestor flashes peace signs during a march, Saturday, May 19, 2012, in Chicago. On Sunday, the start of the two-day NATO summit, thousands of protesters are expected to march to the McCormick Place convention center, where NATO delegates will be meeting. (AP Photo/John Minchillo)
An anti-NATO protestor flashes peace signs during a march, Saturday, May 19, 2012, in Chicago. On Sunday, the start of the two-day NATO summit, thousands of protesters are expected to march to the McCormick Place convention center, where NATO delegates will be meeting. (AP Photo/John Minchillo)

Footage captured on the ground in downtown Chicago depicts high tensions and frequent clashes between protesters and police during NATO summit demonstrations, including several incidents that devolve into violence.

Video released by NBC Chicago shows one protester, then several trying to impede a police van's movement with their bodies, then being pushed down the street when the vehicle continues moving forward.

(See videos above, below.)

In a more recent video, protesters are confronted by police in riot gear, and several altercations between officers and demonstrators appear to turn violent.

Police say 18 people have been arrested over the past week, according to CBS Chicago. Not included in that count are four people arrested on suspicions of two separate terrorist plots who had plans to use Molotov cocktails during the summit, according to police.

View more videos at: http://nbcchicago.com.

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