Revolutionary Struggle, a group operated by Nikos Maziotis and Pola Roupa, claimed it set off the bomb in “striking the interests of the European economic oligarchy,” in a 20,000-word manifesto posted online.
Maziotis and Roupa disappeared in 2012 while awaiting trial for previous terrorist-style attacks, and the bomb and message indicate they have returned, along with their group.
The proclamation linked the blast, in which no one was injured, to past explosions at international bank branches in Athens and the Athens stock exchange, and to the upcoming visit of German Chancellor Angela Merkel.
The Apr. 10 explosion was caused by 75 kilograms (165 pounds) of the explosive ANFO (ammonium nitrate/fuel oil).
“Many enemies of the armed struggle were celebrating they had dismantled the Revolutionary Struggle. This action proves them wrong,” the proclamation said in part.