Groups in cities across the country marched in solidarity Thursday with those in Ferguson, Mo., who have been protesting the killing by a police officer of an unarmed teenager, Michael Brown.

In New York City, hundreds gathered in peaceful protests in several locations. More than 500 protesters marched around Union Square early in the evening, at times placing their hands in the air. At one point demonstrators stopped by officers keeping watch and chanted, "I can't breathe."

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