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An armed policeman stands guard at the entrance of Belgium's federal prosecutor office in Brussels, January 16, 2015. Belgian police arrested 13 people during a dozen raids overnight, smashing plot to kill police officers 'in public roads and in police stations', prosecutors said.
An armed policeman stands guard at the entrance of Belgium's federal prosecutor office in Brussels, January 16, 2015. Belgian police arrested 13 people during a dozen raids overnight, smashing plot to kill police officers 'in public roads and in police stations', prosecutors said.

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    Authorities: Threat in Belgium is ongoing

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Authorities: Threat in Belgium is ongoing

Per capita, Belgium has the highest number of people who are radicalized. CNN's Frederik Pleitgen reports.

Authorities: Threat in Belgium is ongoing

Per capita, Belgium has the highest number of people who are radicalized. CNN's Frederik Pleitgen reports.