**Two police officers have been killed in two explosions in the town of Kizlyar in Russia’s restive North Caucasus republic of Dagestan, reports say.**Russian news agencies said the second blast came 20 minutes after the first.
This comes two days after 39 people were killed in two suicide bombings on the Moscow Metro, for which officials have blamed North Caucasus militants.
Prime Minister Vladimir Putin has called on security forces to “scrape from the sewers” those responsible.
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