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Ukraine's worst cyberattack in four years brought down the websites of scores of government agencies for hours. Authorities didn't immediately identify the source of the hacks, which took place as tensions with Russia intensified over its troop buildup across the border. From a report: Seventy government agencies were were hit, including the Foreign and Agriculture Ministries, Viktor Zhora, the deputy head of the state agency in charge of special communication and information protection, said Friday. Authorities are investigating and will have their first conclusions later in the day, he said. "There was no leak of important data, the content of the websites was not damaged," Ukraine Zhora said. "We are collecting digital evidence and analyzing data to understand the full chain of this attack." Ukraine has previously accused Russia of mounting major cyberattacks against its digital infrastructure. Relations between the two former Soviet partners have worsened since the ouster of a Russian-backed president in 2014 and Moscow's subsequent annexation of Crimea.