VIDEO: Russia subway massive bombing: At least 10 reported dead

Shrapnel bombings, designed to cause untold pain and suffering – timed on the day Putin was in town.

Usually comprised of nails, ball bearings, needles or other small metal objects tearing through human flesh, these shards are the leading cause of death and injury following the explosion of a shrapnel bomb. At least 10 people were killed and dozens injured Monday after an explosion rocked the subway system in the Russian city of St. Petersburg, Russian officials said, in what President Vladimir Putin called a possible act of terror.

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