In the night operation, the police evacuated 28,000 residents of Kalynivka and other small towns in the Vinnytsya oblast near the burning ammunition depot.
No casualties had been reported by 03:00 on Sept. 27.
The area has been sealed off by the 2,800-strong police force.
The adjacent highway and rail roads are closed to traffic. The 50-km air space around the area is banned to aviation.
The fire afflicted 10% of the depot’s total area.
Officials suspect a terrorist act. According to interior minister’s adviser Zoryan Shkyryak, the fire was started on direct orders of Pres Putin. The day of the accident [Pres Poroshenko’s birthday] and the place [Poroshenko’s homeland] speak for themselves.