Demonstrators take part in a protest in front of the building where the grand jury is looking into the shooting death of Michael Brown in Clayton, Missouri, November 17, 2014
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Michael Brown: Missouri governor activates National Guard

The governor of the US state of Missouri has activated the state's National Guard in anticipation of a grand jury decision over the killing of an unarmed black teenager.

A panel is deciding whether to charge Officer Darren Wilson in the August death of Michael Brown, 18.

No specific date for the jury's decision has been given.

Rajini Vaidyanathan reports.

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