The explosion at a testing station of the Research Institute of Chemical Products, which is a part of Ukroboronprom, a defence company in Sumy Region, probably was the result of negligence of officials.
"The primary version is the neglect by officials during the work with increased risks," regional military prosecutor Oleksiy Lyashenko told TV channel 112 Ukraine.
Three people were killed and two wounded in an explosion at the test station of one of the enterprises of the state-owned defence industry company Ukroboronprom in Sumy Region on 28 July. Two other employees were hospitalised in serious condition.