The organization “R.O. 6th December”, that appears for first time, claimed the responsibility for the bomb that was placed outside the ministry of press in Sygrou avenue in Athens and smashed absolutely the building. The communique was published on the mainstream regime-controlled web site zougla.gr
They also claim the responsibility for the bullets that were sent to Pretenderis (journalist) and to Kougias (lawyer of Korkoneas, the cop that killed Alexis Grigoropoulos last December) on 21st December 2008.
It’s not certain that the claim is genuine, but this is what is generally accepted until now, since there is no other communique by another organization.