The Interior Ministry said on Wednesday that firefighters were still putting out the blaze which broke out in the town of Kalynivka, 120 miles (190km) south-west of the capital, Kiev, late on Tuesday.
Authorities bussed more than 30,000 people out of the area, and turned off the electricity and gas supply.
Four residential buildings were damaged by the fire but no casualties have been reported.
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Prime Minister Volodymyr Groysman, who arrived in the area early on Wednesday, said on local television that the situation is under control. The cause of the fire was under investigation.