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- Anti-Putin hackers say they accessed a Russian prison network and stole data, CNN reported.
- The attack came soon after the death of Alexey Navalny was announced in February.
- The hackers told the outlet they sought information that could help them find out what happened to Navalny.
Hackers accessed a computer network connected to Russia's prison system, posting a message in support of the late Alexey Navalny and claiming to have grabbed vast amounts of data, CNN reported.