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This is the shocking moment a suspected bomber walks into a busy supermarket to place an explosive device packed with ball bearings in a storage locker for customer bags, it is believed.
The blast was a “deliberate attempt to kill”, according to the authorities in St Petersburg and has been branded an act of terror by Vladamir Putin.
In the event, 13 were wounded and eight remain in hospital in the Russian city - a key venue for FIFA World Cup matches next year.
The suspect, wearing a green coat and hood, can be seen entering the shop with a backpack believed by police to contain a bomb with the power of 200 grams of TNT.
He walks to the right where, unseen by the camera, he deposits the backpack.