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Police officers with a sniffing dog examine territory around the site of a trolleybus explosion in Volgograd, Russia on Monday December 30.
Police officers with a sniffing dog examine territory around the site of a trolleybus explosion in Volgograd, Russia on Monday December 30.

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    Olympic Chief: Security our top priority

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Olympic Chief: Security our top priority

As the Sochi games draw near, security against terror attacks is still a concern. CNN's Nic Robertson reports.

Olympic Chief: Security our top priority

As the Sochi games draw near, security against terror attacks is still a concern. CNN's Nic Robertson reports.