Aftermath of the bomb Vladislav Roslyakov detonated

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Although we don't know for sure how the bomb was made and what container he used to store it. We know Vlad used ammonium nitrate (fertilizer) for the explosion. However he changed the ingredients that just made it harder to make. He also had bolts and nails for shrapnel. Vlad used a cheap Chinese Timer and most likely an electric blasting cap or gasoline or something which when lit would cause the ammonium nitrate to explode. ( Ammonium nitrate does not explode on its own. Meaning it cannot be lit by itself. It needs something to help it.)
Vlad most likely put the bomb in a pressure cooker or something similar and put a frying pan under it so when detonated, the blast and shrapnel would fly upwards.

The bomb killed 10 people.