A suicide bomber has blown herself up in the capital of the troubled southern republic of Dagestan, Makhachkala, officials say.
At least 11 people, including five policemen, were wounded in the attack, which occurred close to an interior ministry building.
Two police officers and two civilians were said to have been seriously hurt.
In recent years, Russia has seen a number of attacks by women suicide bombers, known as black widows.
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