Russia metro attack
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Three suspects in Russia metro bombing charged with terror
Seven other suspects in the April 3 attack that killed 15 people
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Russian investigators search flat of suspected metro bomber's acquaintances
Objects relevant to investigation found during apartment search, says Investigative Committee
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Russian metro bomb suspect a Muslim born in central Asia: investigators
The suspect could have been inspired by IS militant links, said Russian law enforcement officials
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Saint Petersburg mourns after metro attack by alleged 'suicide bomber'
Heightened security measures in place amid fearful commuters
