Russian media is reporting a man has shot dead a policeman and taken pupils hostage at a school in Moscow's north west.
The gunman is reportedly holding 20 pupils - under the age of15 - but has so far not made any demands.
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The 74-year-old was hanging decorations on the grave for Easter when the freak accident happened, according to local authorities.
Police had issued an urgent appeal to trace Malakhi Chijiutomi-Ghosh, who needs medication three times a day.