Greek police's anti-terrorist unit carried out raids and arrests on Tuesday in connection with attacks by far-left militants, including a bomb mailed to a high court.
The police said in a statement that firearms and explosives were seized during the raids and that six people were arrested in the capital. Four people who are already in prison are suspected of being involved.
The ten suspects are accused of being part of a terrorist organization, of attempted murder and of violating the law on weapons.
The attacks damaged buildings and vehicles, but no one was injured, the AP reported.
Greece has for decades suffered from left-wing militant violence, ranging from bombings and assassinations to small-scale arson attacks.
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Explosives and weapons are seized in a building in Greece
Police have added that the suspects are believed to have been involved in four other small bomb attacks in Athens and Larissa.
The attacks targeted a bank, a construction firm, a car belonging to a prison workshop and a house in Larissa. A group called Revenge Coordination claimed responsibility.
