The blast at the ammunition depot in Kalynivka, Vinnytsya oblast, was made by a terrorist group with the help of a drone, army press secretary Serhij Misuyra writes in Facebook Sept. 27.
Although searches and arrests were made in the area by SBU, not all terrorists must have been rounded up. Those at large, used a drone to drop an incendiary bomb on the depot, he said.
The bulk of the ammunition was in underground shelters. But tank shells and 120-mm mines were in open storage on the ground. They exploded, he said.
30,000 local residents were evacuated after the fire and explosions started late Sept. 26.