The court of Harju district, which serves the area including the capital Tallinn, said it had fined the 20-year-old man 17,500 kroons ($1,635) for organizing the disruption of the server for the web site of the ruling-coalition-leading Reform Party.
"There was only one suspect, and he received the court's verdict yesterday. But investigations are continuing [into other hacking offenses]," prosecutor's office spokesman Gerrit Maesalu said Thursday.
The cyber attacks coincided with two nights of riots and looting by mainly ethnic Russians following the removal of a Soviet war memorial from the center of Tallinn to a military cemetery.
The move angered many Russian-speakers, who saw the monument as a symbol of sacrifices made during World War II.
The disruption of the Reform Party web site was one of many cyber attacks during the disturbances, some of which the Baltic state's government said originated on servers linked to Russian authorities.
Russia has denied any involvement in the attacks, which comprised repeated high volume requests to web sites, forcing them to crash or be paralyzed.
Estonia is trying four men for organizing the riots. One man was stabbed to death in the unrest.
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