The FSB said today the men, both from Central Asia, were killed in a shootout when they resisted arrest.
The agency says the suspects were in contact with recruiters from international terrorist organizations, had shown an interest in making bombs and expressed a readiness to carry out attacks in Russia.
The impoverished, predominantly Muslim countries in Central Asia are seen as fertile ground for Islamic extremists. A citizen of Kyrgyzstan carried out the April 3 suicide bombing on the St. Petersburg subway that killed 14 passengers.
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