Quote:Ferguson, Missouri (CNN) - An evening of peaceful protests devolved into another tense standoff in Ferguson on Monday night as a few protesters hurled bottles and rocks at a heavy police presence, and they responded by firing stun grenades and tear gas canisters.

Police in riot gear and gas masks formed a barricade. They used LRAD (Long Range Acoustic Device (LRAD) crowd control systems to send out piercing and painful sounds to disperse the crowd.

Some officers sat with guns pointed atop armored vehicles, while others darted into the crowd to make an occasional arrest before retreating.

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