The Associated Press - Sunday Jan. 19, 2014 17:15 ET

Sochi Olympics security concern rekindled after Islamic militant threat

Video posted on an extremist website threatens more suicide attacks

russia-explosion
Experts and police officers examine a site of a trolleybus in Volgograd, Russia. The city was the site of two bombings. No one had claimed responsibility until now. (Denis Tyrin/The Associated Press)

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