The monitoring group Crimean Wind reported this on its Telegram channel, based on satellite imagery data, according to Ukrinform.
"Numerous flashes are being recorded in the southern industrial zone of Krasnoperekopsk. Russian forces store and repair their equipment there," the report said.
According to the monitoring group, seven explosions were heard in Krasnoperekopsk between approximately 02:00 and 03:00.
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The Telegram channel also reported that air raid alerts sounded twice in Sevastopol, while gunfire and explosions were heard near Belbek airfield and in the area of the Balaklava Thermal Power Plant.
Ukrinform previously reported that Ukrainian Defense Forces had struck a Russian radar station and UAV repeaters in Crimea.