Protests in a St. Louis suburb roiled by outrage over the death of an unarmed teen descended into chaos Wednesday night, with riot gear-clad police using tear gas on crowds and officers reportedly coming under attack by thrown bottles.

President Barack Obama was briefed Wednesday night on the turmoil in Ferguson, Missouri, which began as a day of demonstrations but turned violent as darkness fell. Police said 16 people were arrested and two officers sustained injuries over the course of the night, police said bottles were thrown at officers, and a police officer was

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