Security experts are investigating whether a power outage that affected parts of the Ukrainian capital, Kiev, and the surrounding region this weekend was the result of a cyberattack. If confirmed, it would be the second blackout caused by hackers in Ukraine.

The incident affected the automation control systems at the northern power substation near Novi Petrivtsi, a village near Kiev, close to midnight between Saturday and Sunday. This resulted in complete power loss for the northern part of Kiev on the right bank of the Dnieper river and the surrounding region.

Engineers from Ukrenergo, Ukraine's national power company, switched the equipment to manual control mode and started restoring power within 30 minutes, said Vsevolod Kovalchuk, acting director of Ukrenergo, in a post on Facebook. Full power was restored to all affected areas in about an hour and 15 minutes.

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