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DENVER -- A national moment of silence was held Thursday after another tense night in Missouri. The vigil honored the unarmed teenager who was shot and killed by a police officer last weekend, as well as others who have suffered brutality.

Dozens showed up at Denver's Civic Center Park to rally against police brutality.

Denver is one of 80 cities across the country that participated in the rally. It attracted a lot of attention on Facebook and Twitter with the hashtag #NMOS14.

Police threw tear gas at protesters overnight in Ferguson. Police maintain Michael Brown was shot during a struggle where he tried to grab the officer's weapon but admit they're still piecing the story together.

New witness Tiffany Mitchell says she saw the unarmed teenager backing away when he was shot.

Missouri's Governor ordered the Highway Patrol to take over security duties in Ferguson Thursday. Protests through the early evening there were peaceful.