Perpetrators in Dnipropetrovsk used-self made shell devices of crater effect, interior minister Vitaly Zakharchenko told a press conference on Friday.

"Specialists of the forensic service and bomb squad have established that the blasts were caused by self made shell devices of crater effect," Zakharchenko said.

The minister specified that the power of the first device was equivalent to 160 g of trotyl, the power output of the second bomb was equivalent to 190 g of trotyl, of the third - to 230 g and of the last - to 300 g.

"Garbage bins themselves were used as destructive agents. The bins are metal-clad and made of asbestos concrete, and with an explosion fly apart," the minister informed.

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